List of auxiliary Interstate Highways

The auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards (with rare exceptions), they receive the same percentage of federal funding (90%), and they comply with other federal standards.

Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat these as bypasses.

These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer interstates may have many such supplemental routes, the numbers may repeat in each state along their route, but they will not repeat within a state.

Terminology and guidelines

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because there are none available, causing a "non-standard" number to be used.

Spur route

An Interstate Highway spur route's number usually has an odd number for its first digit.^[2] It is usually one of the following:

• It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street/avenue or at a substandard freeway, such as I-180 in Lincoln, Nebraska.
• It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
• It may connect two unrelated Interstate highways—such as I-390 in New York State and I-355 in Illinois do.
  • Note that states differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.

Examples of Interstate Highway spur routes are listed below.

• I-110 in California links I-10 with the Port of Los Angeles. This freeway was built before Interstate Highways as the Harbor Freeway. Later, it was adopted into the Interstate Highway System.
• I-180 in North-Central Pennsylvania connects Williamsport and Lycoming County with I-80 in Milton, which does not actually enter Lycoming County. I-180 also serves as a connection to those traveling to New York and I-86 via U.S. Route 15 and the Future I-99 Corridor at its western terminus.
• I-190 in New York connects the cities of Niagara Falls and Buffalo with I-90.

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples are listed below.

• I-380 in Northern California is located at the San Francisco Bay Area. This highway begins at I-280, and it connects with US 101.
• I-190 branches off from I-290 in Massachusetts, and it never connects with its parent, I-90.
• I-795 in Baltimore County, Maryland branches off from I-695.

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.^[2]

Examples of bypass routes are listed below.

• I-215 in Utah travels part of the perimeter of Salt Lake City.
• I-220 in Louisiana serves as a bypass of downtown Shreveport.
• I-440 forms a loop around the south side of Nashville.
• I-205 in Oregon and Washington serves as a bypass of downtown Portland, Oregon.

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini, however they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.^[2]

Some examples of beltways are listed include:

• I-275 in Ohio, Kentucky and Indiana encircles the city of Cincinnati.
• I-465 in Indiana encircles the city of Indianapolis.
• I-495 in Maryland and Virginia encircles the city of Washington, D.C. and is referred to as "The Capital Beltway".

Auxiliary Interstates

Note: the table sorts the route numbers by parent highway.

Number	Length (mi)[3]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
01Hawaii-2 !H-201	4.10	6.60	H-1 in Halawa	H-1 in Honolulu	1989[4]	current	Signed as Route 78 until 2004
05California-1 !I-105	17.32	27.87	SR 1 in El Segundo	I-605 in Norwalk	1963	current	Replaced segments of SR 42
05California-2 !I-205	12.97	20.87	I-580 near Tracy	I-5 near Tracy	1970	current
05California-3 !I-305	6.00	9.66	I-80 in West Sacramento	I-80 Bus/US 50/SR 99 in Sacramento	1981	current	Unsigned
05California-4 !I-405	72.15	116.11	I-5 in Irvine	I-5 in Mission Hills	1964	current
05California-5 !I-505	32.98	53.08	I-80 in Vacaville	I-5 in Dunnigan	1977	current	Originally part of Interstate I-5W
05California-6 !I-605	27.40	44.10	I-405 in Seal Beach	I-210 in Irwindale	1964	current
05California-8 !I-805	28.02	45.09	I-5 in San Ysidro	I-5 in Sorrento Valley	1959	current
05California-9 !I-905	8.96[5]	14.42	I-5 in San Ysidro	Fed. 2 at the United States-Mexico border in Otay Mesa	proposed	—	Currently SR 905, proposed to be signed as an Interstate
05OR-1 !I-105	3.49	5.62	OR 99 in Eugene	I-5 in Springfield	2011	current
05OR-4 !I-405	3.53	5.68	I-5 in Portland	I-5 in Portland	—	—
05Washington-2 !I‑205	36.64	58.97	I-5 in Tualatin, OR	I-5 in Salmon Creek, WA	1975	current
0WA5-4 !I‑405	30.30	48.76	I-5/SR 518 in Tukwila	I-5/SR 525 in Lynnwood	1964	current
05Washington-6 !I‑605	—	—	—	—	proposed	—	Proposed to bypass Seattle
05Washington-7 !I‑705	1.50	2.41	I-5/SR 7 in Tacoma	—	1990	current	Schuster Parkway in Tacoma
10-2 !I‑210	—	—	I-10 in Mobile (original southern terminus)	I-65 in Prichard	—	—	Currently I-165, the route number was decommissioned because it had no connection to I-10
10-4 !I-410	—	—	I-10/I-17 in Phoenix	I-10 in Phoenix	—	—	Now part of I-10 in Phoenix, Arizona
10-5 !I-510	—	—	I-10/SR 51 in Phoenix	SR 101 in Phoenix	—	—	Currently designated as Arizona State Route 51 (Piestewa Freeway)
10-7 !I-710	—	—	I-10 in Tucson	N Campbell Avenue/E 6th Street in Tucson	—	—	Mostly never built freeway that was to connect to University of Arizona campus from I-10
10California-1 !I-110	20.43	32.88	SR 47 in San Pedro, Los Angeles	I-10/SR 110 in Los Angeles	1978	current	Originally part of US 66, then signed as SR 11
10California-2 !I-210	48.72	78.41	I-5 in Sylmar	SR 57/SR 210 in Glendora	1964	current	Segment from SR 57 east to I-10 is still signed as the state highway SR 210, formerly SR 30 prior to 2007.
10California-7 !I-710	19.66	31.64	Terminal Island in Long Beach	Valley Boulevard in Alhambra	1983	current	Originally signed as SR 7
10Florida-1 !I-110	6.94	11.17	US 98 Bus near Pensacola	I-10 near Pensacola	1969	current
10Louisiana-1 !I-110	8.89	14.31	I-10 in Baton Rouge	US 61 in Baton Rouge	1965	current
10Louisiana-2 !I-210	12.40	19.96	I-10 near Sulphur	I-10 in Lake Charles	1962	current
10Louisiana-3 !I-310	11.25	18.11	US 90 in Boutte	I-10 near Kenner	1993	current
10Louisiana-3 !I-310	—	—	—	—	1964	1969	Never built (Vieux Carré Riverfront Expressway)
10Louisiana-5 !I-510	5.10	8.21	LA 47 in New Orleans	I-10 in New Orleans	1992	current
10Louisiana-6 !I-610	4.52	7.27	I-10 at the Orleans-Jefferson Parish	I-10 in New Orleans	1956	current
10Louisiana-9 !I-910	9.70	15.61	US 90 Bus in Marrero	I-10 in New Orleans	1999	current	Unsigned
10Mississippi-1 !I-110	4.10	6.60	US 90 in Biloxi	I-10 in D'Iberville	1988	current
10Mississippi-3 !I-310	—	—	US 90 near the Port of Gulfport	I-10 in Gulfport	proposed	—	Future spur into Gulfport, MS
10Texas-1 !I-110	0.92	1.48	Av Abraham Lincoln at the United States-Mexico border in El Paso	I-10 in El Paso	1967	current	Shortest signed Interstate in the country
10Texas-4 !I-410	49.49	79.65	Beltway around San Antonio		1959	current
10Texas-6 !I-610	37.97	61.11	Beltway around Houston		1975	current
15California-2 !I-215	54.50	87.71	I-15 in Murrieta	I-15 in Devore	1982	current	Originally signed as I-15E, then SR 215
15Montana-1 !I‑115	1.19	1.92	I-15/I-90 in Butte	Iron Street in Butte	1971	current
15Montana-3 !I‑315	0.83	1.34	I-15 in Great Falls	I-15 Bus/US 89 in Great Falls	1960	current	Unsigned
15Nevada-2 !I‑215	11.10	17.86	I-15/Clark County Route 215 near Paradise	I-515/US 93/SR 564 in Henderson	1996	current
15Nevada-5 !I‑515	20.54	33.06	US 93/US 95 in Henderson	I-15/US 93/US 95 in Las Vegas	1976	current	Not signed until 1994
15Utah-2 !I-215	29.02	46.70	I-80 in Salt Lake City	I-15 in North Salt Lake	1963	current
16Georgia-5 !I‑516	6.49	10.44	SR 21/SR 204 in Savannah	SR 21 in Garden City	1985	current
20Georgia-4 !I‑420	5.40	8.69	I-285 in College Park	I-20 in Atlanta	1983	1986	Never built, was planned to bypass Atlanta
20Georgia-5 !I‑520	16.14	25.97	I-20 in Augusta, GA	I-20 in North Augusta, SC	1980	current
20Louisiana-2 !I-220	17.62	28.36	I-20 in Shreveport	I-20 in Bossier City	1991	current
20Louisiana-4 !I-420	—	—	I-20 in Monroe	I-20 in Monroe	—	—	Never built, was planned to bypass Monroe, Louisiana
20Mississippi-2 !I-220	12.01	19.33	I-20 in Jackson	I-55 in Ridgeland	1981	current
20Texas-8 !I-820	35.17	56.60	I-20 in Fort Worth	I-20 / US 287 in Fort Worth	1959	current
22Alabama-2 !I‑222	—	—	I-22 near Birmingham, AL	Interstate 422 near Birmingham, AL	proposed	—
22Alabama-4 !I‑422	—	—	I-20/I-59/I-459/US 11 in Bessemer	I-59 in Argo	proposed	—
24Tennessee-1 !I-124	1.97	3.17	I-24 in Chattanooga	US 27 in Chattanooga	1960	current	Unsigned
25Colorado-2 !I-225	12.00	19.31	I-25 in Denver	I-70 in Aurora	1976	current
26South Carolina-1 !I-126	3.68	5.92	I-26 in Columbia	US 21/US 76/US 176/US 321 in Columbia	1961	current
26South Carolina-3 !I-326	5.24	8.43	I-26 in Cayce	SC 48 in Columbia	1976	1995	Now part of I-77, formally unsigned
26South Carolina-5 !I-526	19.26	31.00	US 17 in Charleston	I-526 Bus/US 17 in Mount Pleasant	1989	current
29Iowa-1 !I-129	3.48	5.60	US 20/US 75/US 77 in South Sioux City, NE	I-29/US 20/US 75 in Sioux City, IA	1976	current
29Missouri-2 !I-229	14.97	24.09	I-29 in St. Joseph	I-29/US 59/US 71 in St. Joseph	1986	current
29South Dakota-2 !I-229	11.33	18.23	I-29 in Sioux Falls	I-90 near Sioux Falls	1966	current
30Arkansas-1 !I-130	—	—	—	—	proposed	—	Proposed route in Texarkana
30Arkansas-4 !I-430	12.93	20.81	I-30/US 67 in Little Rock	I-40/US 65 in Little Rock	1980	current
30Arkansas-5 !I-530	46.65	75.08	US 65 in Pine Bluff	I-30/I-440 in Little Rock	1999	current
30Arkansas-6 !I-630	7.40	11.91	I-430 near Little Rock	I-30 in Little Rock	1985	current
35Iowa-2 !I-235	13.78	22.18	I-35/I-80 in West Des Moines	I-35/I-80 near Des Moines	1961	current
35Kansas-1 !I-135	95.74	154.08	Kan. Tpk./I-35 in Wichita	I-70/US 81 in Salina	1976	current
35Kansas-2 !I-235	16.52	26.59	I-135/US 81 in Wichita	I-135/US 81/K-15/K-254 in Wichita	1965	current
35Kansas-3 !I-335	50.13	80.68	I-35/Kan. Tpk./US 50 in Emporia	I-470/Kan. Tpk. in Topeka	1987	current
35Kansas-4 !I-435	80.81	130.05	Beltway around Kansas City, KS and Kansas City, MO		1965	current
35Kansas-6 !I-635	8.90	14.32	I-35 in Overland Park, KS	I-29/US 71 in Kansas City, MO	1968	current
35Minnesota 3 !I-335	2.74[6]	4.41	I-94 in Minneapolis	I-35W in Minneapolis	1964	1978	Cancelled
35Minnesota-5 !I-535	2.78	4.47	I-35/US 53 in Duluth, MN	US 53/WIS 35 in Superior, WI	1971	current
35Oklahoma-2 !I-235	5.36	8.63	I-35/I-40 in Oklahoma City	I-44 in Oklahoma City	1989	current
35Texas-6 !I-635	37.00	59.55	SH 121 in Grapevine	I-20 in Balch Springs	1959	current
38-2 !I-238	2.23	3.59	I-880 in San Leandro, CA	I-580/SR 238 in Castro Valley, CA	1983	current	Considered an auxiliary route of I-80 in California; there is no I-38
40Arkansas-4 !I-440	9.96	16.03	I-30/I-530 near Little Rock	I-40/AR 440 near Little Rock	2003	current
40Arkansas-5 !I-540	15.87	25.54	US 271/AR 253 near Fort Smith	US 62/US 71 in Bentonville	1965	current
40North Carolina-1 !I‑140	6.79	10.93	US 17/US 421 near Navassa	I-40/US 17 in Wilmington	2008	current
40North Carolina-2 !I‑240	9.54	15.35	I-26/I-40/US 74 near Asheville	I-40/US 74A in Asheville	1980	current
40North Carolina-4 !I‑440	16.77	26.99	I-40/US 1/US 64 near Cary	I-40 near Raleigh	1991	current
40North Carolina-5 !I‑540	25.84	41.59	I-40 near Durham	I-495/US 64/US 264 near Knightdale	1997	current
40North Carolina-8 !I‑840	5.77	9.29	I-40/I-73/US 421 in Greensboro	I-40/I-85/I-785/I-85 Bus. in Greensboro	2011	current
40Oklahoma-2 !I-240	16.22	26.10	I-44/US 62 in Oklahoma City	I-40/US 270 in Oklahoma City	1965	current
40-4 !I-440	9.96	16.03	I-40/I-240 near Oklahoma City	I-35 in Oklahoma City	—	—	Now part of I-44
40Tennessee-1 !I-140	11.17	17.98	I-40 near Farragut	US 129 near Alcoa	1987	current
40Tennessee-2 !I-240	19.27	31.01	I-40 in Memphis	I-40 in Memphis	1970	current
40Tennessee-4 !I-440	7.64	12.30	I-40 in Nashville	I-24 in Nashville	1987	current
40Tennessee-6 !I-640	7.03	11.31	I-40 in Knoxville	I-40 in Knoxville	1982	current
40Tennessee-8 !I-840	77.28[7]	124.37	I-40 near Dickson	I-40 near Lebanon	2016	current
44Oklahoma-2 !I-244	15.75	25.35	I-44 in Tulsa	I-44 in Tulsa	1970	current
44Oklahoma-4 !I-444	2.51	4.04	I-244 in Tulsa	I-244 in Tulsa	1970	current	Unsigned
45-3 !I-345	1.40	2.25	I-30/I-45 in Dallas, TX	US 75 in Dallas, TX	1973	current	Unsigned
55Arkansas-5 !I-555	49.8	80.1	I-55 in Turrell	AR 91 in Jonesboro	2016	current
55Illinois-1 !I-155	32.13	51.71	I-74 in Morton	I-55 in Lincoln	1992	current
55Illinois-2 !I-255	30.82	49.60	I-55/I-270 in Mehlville, MO	I-270/IL 255 in Pontoon Beach, IL	1986	current
55Illinois-3 !I-355	32.51	52.32	I-80 in New Lenox	I-290 in Itasca	1989	current
55Tennessee-1 !I-155	15.93	25.64	I-55 near Hayti, MO	US 51 at Dyersburg, TN	1980	current
55Tennessee-2 !I-255	—	—	I-55/I-240 in Memphis	I-40 in Memphis	—	—	Now part of I-55 and I-240
59Alabama-3 !I‑359	2.30	3.70	I-20/I-59 in southern Tuscaloosa	15th Street in downtown Tuscaloosa	1983	current
49Alabama-4 !I‑459	32.80	52.79	I-20/I-59 in Bessemer	I-59 in Trussville	1984	current
59Alabama-7 !I‑759	4.50	7.24	I-59 in Attalla	US-411/SR-759 in Gadsden	1986	current
64Indiana-1 !I-164	21.39[8]	34.42	US 41/Veterans Memorial Parkway in Evansville, IN	I-69 in Evansville, IN	1990	2014	Decommissioned; now part of I-69[9]
64Kentucky-2 !I-264	22.93	36.90	I-64 in Louisville	I-71 in Louisville	1956	current
64Virginia-2 !I‑264	25.07	40.35	I-64/I-664 in Chesapeake	Parks Ave in Virginia Beach	1960	current
64Virginia-4 !I‑464	4.71	7.58	I-64 in Chesapeake	I-264 in Norfolk	1960	current
65Virginia-5 !I‑564	3.03	4.88	SR 337	I-64 in Norfolk	1970	current
64Virginia-6 !I‑664	20.21	32.52	I-64/I-264 in Norfolk	I-64 in Hampton	1971	current
65Alabama-1 !I‑165	4.90	7.89	US-43 in Mobile	I-65 in Mobile	1994	current
65Alabama-5 !I‑565	21.40	34.44	I-65/US-72/SR-20 in Decatur	US-72 in Huntsville	1991	current
65Indiana-1 !I-165	2.7	4.3	I-65/I-70 in Indianapolis	38th Street in Indianapolis	1978	1981	Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
65Indiana-2 !I-265	6.73	10.83	I-64 in New Albany, IN	SR 62/SR 265 in Clarksville, IN	1977	current	Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
65Indiana-4 !I-465	52.79	84.96	Beltway around Indianapolis		1970	current
65Indiana-8 !I-865	4.72	7.60	I-65 near Indianapolis	I-465 near Indianapolis	2002	current
65Kentucky-2 !I-265	24.48	39.40	I-65/KY 841 in Heritage Creek	I-71/KY 841 in Prospect	1977	current	To be connected with I-265 in Indiana in late 2016 with the completion of the East End Bridge
65Kentucky-5 !I-565	—	—	Owensboro, KY	I-65 in Bowling Green, KY	proposed	—	Proposed to be designated along William H. Natcher Parkway once put into interstate standards
65Tennessee-2 !I-265	—	—	I-40 in Nashville	I-65 in Nashville	—	—	Now part of I-65
69Indiana-4 !I-469	30.83	49.62	I-69 in Fort Wayne	I-69 in Fort Wayne	1995	current
69Kentucky-1 !I-169	49	79	I-24 near Hopkinsville, Kentucky	I-69 in Nortonville, Kentucky	2017	current	New designation along the former Pennyrile Parkway
69Kentucky-3 !I-369	—	—	Future I-69/Pennyrile Parkway in Henderson	US 60 in Owensboro	proposed	—
69Mississippi-2 !I-269	4.20	6.76	I-55/I-69 in Hernando, MS	I-69 in Millington, TN	2015	current	Currently under construction; partially open
69Tennessee-1 !I-169	—	—	Union City, TN	Martin, TN	proposed	—
69Texas-1 !I-169	1.50	2.41	I-69E/US 77/US 83 in Olmito	Port of Brownsville main entrance in Brownsville	2015	current	Currently under construction; partially open and co-signed with SH 550
69Texas-3 !I-369	3.50	5.63	Tenaha	Texarkana, Texas	2013	current	Partially completed in 2013
70Colorado-2 !I-270	5.31	8.55	I-25/US 36 at Welby	I-70/US 36 at Denver	1965	current
70Colorado-4 !I-470	—	—	Beltway around Denver Metro		—	—	Now part of Colorado State Highway 470
70Illinois-2 !I-270	50.59	81.42	I-55/I-255 in Mehlville, MO	I-55/I-70 near Troy, IL	1956	current
70Kansas-4 !I-470	13.72	22.08	I-70 in Topeka	I-70/Kan. Tpk. in Topeka	1960	current
70Kansas-6 !I-670	2.81	4.52	I-70 in Kansas City, KS	I-70 in Kansas City, MO	1968	current
70MD-1 !I-170	2.3	3.7	I-70	US 40	1969	1983	Cancelled
70MD-2 !I-270	34.40	55.36	I-70 near Frederick	I-495 north of Bethesda	1975	current
70MD-2S !I-270 Spur	2.10[10]	3.38	I-270 east of Potomac	I-495 northwest of Bethesda	1975	current
70MD-3 !I-370	2.54	4.09	I-270 in Gaithersburg	MD 200 in Derwood	1988	current
70Missouri-1 !I-170	11.17	17.98	I-64/US 40 in Richmond Heights	I-270 in Hazelwood	1956	current
70Missouri-4 !I-470	16.72	26.91	I-49/I-435 in Kansas City, MO	I-70 in Independence, MO	1983	current
70Ohio-2 !I-270	54.97	88.47	Beltway around Columbus		1964	current
70Ohio-4 !I-470	6.69	10.77	I-70 near Blaine, OH	I-70 in Elm Grove, WV	1976	current
70Ohio-6 !I-670	9.37	15.08	I-70 in Columbus	I-270 near Port Columbus International Airport	2003	current
71Ohio-2 !I-271	46.06	74.13	I-71 near Medina, OH	I-90 in Willoughby Hills, OH	1964	current
71Ohio-4 !I-471	5.75	9.25	I-275 near Newport, KY	I-71 in Cincinnati, OH	1981	current
72Illinois-1 !I-172	19.69	31.69	I-72 in Quincy, IL	US 24 in Quincy, IL	1995	current
74Illinois-4 !I-474	14.88	23.95	I-74 in Peoria, IL	I-74 in Morton, IL	1973	current
74North Carolina-2 !I‑274	—	—	—	—	proposed	—	Proposed route in Winston-Salem
75Florida-1 !I-175	1.44	2.32	I-275 in St. Petersburg, FL	SR 687 in St. Petersburg, FL	1980	current
75Florida-2 !I-275	60.64	97.59	I-75 near Memphis	I-75 in Wesley Chapel	1973	current
75Florida-3 !I-375	1.34	2.16	I-275 in St. Petersburg	US 92 in St. Petersburg	1979	current
75-1 !I‑175	—	—	U.S. Route 82 in Albany	I-75 in Cordele	—	—	Now part of State Route 300
75Georgia-4 !I‑475	15.83	25.48	I-75 in Macon	I-75 in Macon	1965	current
75Georgia-5 !I‑575	30.97	49.84	I-75 in Kennesaw	SR 5 west of Nelson	1985	current
75Georgia-6 !I‑675	11.04	17.77	I-75 in Stockbridge, GA	I-285 southeast of Atlanta, GA	1987	current
75Indiana-2 !I-275	83.71	134.72	Beltway around Cincinnati, OH		1962	current	Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
75Michigan-2 !I-275	35.01[11][lower-alpha 1]	56.34	I-75 near Monroe, MI	I-96, I-696 & M-5 in Farmington Hills	1977	current
75Michigan-3 !I-375	1.06	1.71	BS I-375 in Detroit, MI	I-75 in Detroit, MI	1964	current
75Michigan-4 !I-475	16.99	27.34	I-75 near Grand Blanc, MI	I-75/US 23 near Mount Morris, MI	1973	current	Runs east and north of Flint, MI
75Michigan-6 !I-675	7.72	12.42	I-75/US 23 near Saginaw, MI	I-75/US 23 near Zilwaukee, MI	1971	current
75Ohio-4 !I-475	20.37	32.78	I-75 in Perrysburg	I-75 in Toledo	1964	current
75Ohio-6 !I-675	26.53	42.70	I-75 near Miamisburg	I-70 near Medway	1987	current
75-1 !I-175	—	—	I-75 in Chattanooga	I-75 in Lexington	—	—
75Tennessee-2 !I-275	2.98	4.80	I-40 in Knoxville	I-75/I-640 in Knoxville	1982	current
75-4 !I-475	—	—	I-40/I-75 near Knoxville	I-75 near Knoxville, TN	—	—
76New Jersey-6 !I-676	6.90	11.10	I-76/US 30 in Philadelphia	I-76 in Camden, NJ	1991	current
76Pennsylvania-1 !I-176	11.33	18.23	I-76/Penna Tpk. in Morgantown	US 422 near Reading	1964	current
76Pennsylvania-2 !I-276	32.65	52.55	I-76 in King of Prussia	Delaware River bridge (Pennsylvania-NJ state line)(current) I-95/I-295 in Bristol Township (future)	1964	current
76Pennsylvania-3 !I-376	78.70	126.66	I-80 near Hermitage	I-76/US 22 in Monroeville	1972	current
76Pennsylvania-4 !I-476	129.61	208.59	I-95 near Chester, PA	I-81 near Clarks Summit, PA	1992	current	Longest Auxiliary Interstate in the country
76Pennsylvania-5 !I-576	—	—	—	—	proposed	—	Proposed Southern Beltway route from Pittsburgh International Airport to I-376
77North Carolina-2 !I‑277	4.46	7.18	Beltway around uptown Charlotte, NC		1981	current
77Ohio-2 !I-277	4.14	6.66	I-76 in Akron	I-77 in Akron	1970	current
78New Jersey-2 !I-278	35.62	57.32	US 1/9 in Linden, New Jersey	Bruckner Interchange in Bronx, New York	1961	current
75New York-4 !I-478	2.14	3.44	I-278 in Brooklyn, New York	NY 9A in Manhattan, New York	1971	current	Unsigned
78New York-6 !I-678	14.33	23.06	John F. Kennedy International Airport in Queens, New York	Bruckner Interchange in Bronx, New York	1965	current
78New York-8 !I-878	0.70	1.13	I-678 in Queens, New York near JFK Airport	JFK Expressway in Queens, New York near JFK Airport	1970	current	Unsigned
79Pennsylvania-2 !I-279	13.32	21.44	I-376/US 22/US 30 in Pittsburgh	I-79 in Franklin Park	1972	current
79Pennsylvania-5 !I-579	1.57	2.53	PA 885 in Pittsburgh	I-279/PA 28 in Pittsburgh	1962	current
80California-1 !I-180	—	—	US 101 in San Rafael	I-80 near Berkeley	1978	1991	Temporary designation of what was formerly part of SR 17, now part of I-580.
80California-2 !I-280	57.22	92.09	I-680/US 101 in San Jose	King Street in San Francisco	1964	current
80California-3 !I-380	1.671	2.689	I-280 in San Bruno	US 101	1964	current
80California-4 !I-480	—	—	I-80 in San Francisco	Sansome Street in San Francisco	1957	1968	Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
80California-5 !I-580	75.63	121.71	US 101 in San Rafael	I-5 near Westley	1964	current	Segments were originally part of I-5W
80California-6 !I-680	70.52	113.49	I-280/US 101 in San Jose	I-80 in Cordelia	1955	current	Originally SR 21
80California-7 !I-780	6.50	10.46	I-80 in Vallejo	I-680 in Benicia	1955	current	Originally part of I-680
80California-8 !I-880	47.22	75.99	I-280/SR 17 in San Jose	I-80/I-580 in Oakland	1983	current	Originally part of SR 17
80California-8 !I-880	—	—	—	—	—	—	Now part of Interstate 80
80California-9 !I-980	2.03	3.27	I-880 in Downtown Oakland	I-580/SR 24 in Oakland	1981	current
80Nevada-5 !I‑580	30.09	48.43	US 50 in Carson City	I-80 in Reno	2012	current	Runs concurrently with US 395
80Illinois-1 !I-180	13.19	21.23	IL 26/IL 71 in Hennepin, Illinois	I-80 near Princeton, Illinois	1969	current
80Illinois-2 !I-280	26.98	43.42	I-80 near Davenport, IA	I-74/I-80 near Colona, IL	1990	current
80Iowa-3 !I-380	73.05	117.56	I-80 near Iowa City	US 218 in Waterloo	1985	current	Connects Cedar Rapids with I-80
80Iowa=4 !I-480	4.90	7.89	I-80/US 75 in Omaha, NE	I-29/US 6 in Council Bluffs, IA	1966	current
80Iowa=6 !I-680	42.86	68.98	I-80 in Omaha, NE	I-80 near Neola, IA	1966	current
80Nebraska-1 !I-180	3.18	5.12	US 34 (9th St. / 10th St.) in Lincoln	I-80 / US 34 / US 77 in Lincoln	1965	current
80Nebraska 5 !I-280	—	—	—	—	—	—	Now designated as I-680
80Nebraska 5 !I-580	1.60	2.57	I-480 in Omaha	Lake Street in Omaha	1976	1982	Now part of US 75
80New Jersey-2 !I-280	17.85	28.73	I-80 in Parsippany-Troy Hills	I-95/NJ Tpk. in Kearny	1958	current
80Ohio-2 !I-280	12.41	19.97	I-75 in Toledo, OH	I-80/I-90/Ohio Tpk. in Lake Township, OH	1959	current
80Ohio-3 !I-380	—	—	I-76/I-77 in Akron, OH	I-271 in Macedonia, OH	proposed	—
80Ohio-4 !I-480	41.77	67.22	I-80/Ohio Tpk. in North Ridgeville, OH	I-80/Ohio Tpk. in Streetsboro, OH	1971	current
80Ohio-6 !I-680	16.43	26.44	I-76/Ohio Tpk. in North Lima, OH	I-80/SR 11 near Mineral Ridge, OH	1964	current
80Pennsylvania-1 !I-180	28.85	46.43	US 15/US 220 in Williamsport, PA	I-80/PA 147 near Milton, PA	1984	current
80Pennsylvania-1 !I-180	—	—	—	—	—	—	Now part of I-176
80Pennsylvania-2 !I-280	—	—	—	—	—	—	Now part of Pennsylvania Turnpike
80Pennsylvania-3 !I-380	24.76	39.85	I-80 in Tunkhannock Township. PA	I-81/I-84/US 6 in Dunmore, PA	1973	current
80Pennsylvania-4 !I-480	—	—	—	—	—	—	Now part of Interstate 476
80Wyoming-1 !I-180	1.09	1.75	I-80 in Cheyenne, WY	I-80 Bus/US 30 in Cheyenne, WY	1984	current	Not built to Interstate Highway standards
81New York-4 !I-481	15.04	24.20	I-81 in Onondaga, NY	I-81/NY 481 in North Syracuse	1970	current
81New York-7 !I-781	4.30	6.92	I-81 in Pamelia, NY	Fort Drum main gate in Le Ray, NY	2012	current
81Virginia-3 !I‑381	1.67	2.69	SR 381 in Bristol	I-81 in Bristol	1961	current
81Virginia-5 !I‑581	6.64	10.69	US 220/SR 24 in Roanoke	I-81 near Hollins	—	—
82Washington-1 !I‑182	15.19	24.45	I-82/US 12 near Richland	US 12/US 395 in Pasco	1986	current
83Pennsylvania-2 !I-283	2.91	4.68	I-76/Penna Tpk. near Highspire	I-83/US 322/Capital Beltway near Harrisburg	1972	current
84Connecticut-3 !I-384	8.20	13.20	I-84/US 6 in East Hartford	US 6/US 44 in Bolton	1984	current
84Connecticut-6 !I-684	28.47	45.82	I-287 near White Plains, NY	NY 22 near Brewster, NY	1974	current	Also crosses into Connecticut
84Idaho-1 !I-184	3.62	5.83	I-84 in Boise, ID	US 20/US 26	1990	current
85Alabama-6 !I‑685	14.00	22.53	I-65 in downtown Montgomery, AL	I-85 in Montgomery, AL	proposed	—
85Georgia-1 !I‑185	49.30	79.34	US 27/US 280/SR 520 in Columbus	I-85 near LaGrange	1979	current
85Georgia-2 !I‑285	63.98	102.97	Beltway around Atlanta, GA		1969	current
85Georgia-4 !I‑485	5.9	9.5	I-75/I-85 in Atlanta	I-85 in Atlanta	—	—	Now Freedom Parkway, was planned to relive traffic along Downtown Connector (I-75/85) through downtown Atlanta.
85Georgia-9 !I‑985	24.04	38.69	I-85 near Buford, GA	SR 369 near Gainesville	1985	current
85North Carolina-2 !I‑285	—	—	I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC	I-40/US 52/US 311/NC 8 in Winston-Salem, NC	proposed	—
85North Carolina-4 !I‑485	66.68	107.31	Beltway around Charlotte, NC		1988	current
85North Carolina-7 !I‑785	2.21	3.56	I-40/I-85/I-840/I-85 Bus. in Greensboro, NC	US 70 in Greensboro, NC	2013	current	Future northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
85North Carolina-8 !I‑885	—	—	—	—	proposed	—
85South Carolina-1 !I-185	17.70	28.49	I-385 near Mauldin, SC	US 29 in Greenville, SC	1955	current
85South Carolina-3 !I-385	42.16	67.85	I-26 near Clinton, SC	US 276 in Greenville, SC	1962	current
85South Carolina-5 !I-585	2.25	3.62	US 176/US 221/SC 9 in Spartanburg, SC	I-85 Bus./US 176 near Spartanburg, SC	1962	current
87New Jersey-2 !I-287	98.72	158.87	I-95/NJ Tpk. in Edison, NJ	I-95 in Rye, NY	1961	current
87New York-5 !I-587	1.21	1.95	I-87/Thruway/NY 28 in Kingston, NY	NY 28/NY 32 in Kingston, NY	1960	current
87North Carolina-5 !I‑587	—	—	Future I 87 (current US 64) near Zebulon, NC	US 264 near Greenville, NC	proposed[14]	—
87New York-7 !I-787	10.16	16.35	I-87/Thruway in Albany, NY	NY 7 in Green Island, NY	1968	current
89-1 !I-189	1.49	2.40	US 7 in South Burlington, VT	I-89 in South Burlington	1980	current
90Illinois-1 !I-190	3.07	4.94	O'Hare International Airport in Chicago, IL	I-90 in Chicago, IL	1978	current
90Illinois-2 !I-290	29.84	48.02	I-90/IL 53 in Rolling Meadows, IL	I-90/I-94/Congress Parkway in Chicago, IL	1972	current
90Illinois-4 !I-490	—	—	I-294	I-90	proposed	—	Proposed route number for the O'Hare West Bypass[15]
90Massachusetts-1 !I‑190	19.26	31.00	I-290 in Worcester, MA	Route 2 in Leominster, MA	1983	current
90Massachusetts-2 !I‑290	20.16	32.44	I-395 in Auburn, MA	I-495 in Marlborough, MA	1970	current
90New York-1 !I-190	28.34	45.61	I-90/Thruway in Cheektowaga, NY	Highway 405 at Lewiston, NY	1959	current
90New York-2 !I-290	9.80	15.77	I-190 in Tonawanda, NY	I-90/Thruway in Williamsville, NY	1964	current
90New York-3 !I-390	76.06	122.41	I-86/NY 17 in Avoca, NY	I-490 in Gates, NY	1973	current
90New York-4 !I-490	37.40	60.19	I-90/Thruway in Bergen, NY	I-90/Thruway in Victor, NY	1970	current
90New York-5 !I-590	5.31	8.55	I-390 in Brighton, NY	I-490/NY 590 in Rochester, NY	1980	current
90New York-6 !I-690	14.19	22.84	I-90/Thruway/NY 690 in Van Buren, NY	I-481 in East Syracuse, NY	1962	current
90New York-7 !I-790	2.41	3.88	I-90/Thruway in Deerfield, NY	NY 5A/NY 55 in Utica, NY	1961	current
90New York-8 !I-890	9.35	15.05	I-90/Thruway in Rotterdam, NY	I-90/Thruway in Guilderland, NY	1962	current
90New York-9 !I-990	6.35	10.22	I-290 in Amherst, NY	NY 263 near Lockport, NY	1985	current	Highest numbered Interstate in the Interstate system
90Ohio-4 !I-490	2.43	3.91	I-71/I-90 in Cleveland, OH	East 55th Street in Cleveland, OH	1990	current
90South Dakota-1 !I-190	1.72	2.77	I-90 in Rapid City, SD	US 16 in Rapid City, SD	1962	current
91Connecticut-2 !I-291	6.02	9.69	I-91 in Windsor, CT	I-84 in Manchester, CT	1994	current
91Connecticut-6 !I-691	8.38	13.49	I-84 at the Southington-Cheshire town line, CT	I-91 in Meriden, CT	1988	current
91Massachusetts-2 !I‑291	5.44	8.75	I-91 in Springfield, MA	I-90/Mass Pike in Chicopee, MA	1972	current
91Massachusetts-3 !I‑391	4.46	7.18	I-91 in Chicopee, MA	High Street in Holyoke, MA	1970	current
93-2 !I‑293	11.18	17.99	I-93/NH 101 in Manchester, NH	I-93/Everett Tpke in Hooksett, NH	2008	current
93-3 !I‑393	4.60	7.40	I-93 in Concord, NH	NH 9 in Pembroke, NH	1979	current
94Illinois-2 !I-294	53.42	85.97	I-80/I-94 in South Holland, Illinois	I-94 in Deerfield, Illinois	1968	current
94Michigan-1 !I-194	3.38	5.44	I-94 in Battle Creek. MI	M-66 in Battle Creek, MI	1961	current
94Minnesota-3 !I-394	9.75	15.69	I-494/US 12 in Minnetonka, MN	4th Street in Minneapolis, MN	1991	current
94Minnesota-4 !I-494	42.94	69.11	I-94/I-694 in Maple Grove, MN	I-94/I-694 in Woodbury, MN	1985	current	Western and southern half of the Minneapolis–St. Paul beltway
94Minnesota-6 !I-694	22.62	36.40	I-94/I-494 in Maple Grove, MN	I-94/I-494 in Woodbury, MN	1970	current	Northern and eastern half of the Minneapolis–St. Paul beltway
94North Dakota-1 !I-194	1.20	1.93	McKenzie Drive near Bismarck, ND	I-94 near Mandan, ND	—	—	Unsigned
94Wisconsin-7 !I-794	3.75	6.04	I-43/I-94 in Milwaukee, WI	WIS 794 in Milwaukee, WI	1980	current
94Wisconsin-8 !I-894	4.70	7.56	I-94 in Milwaukee, WI	I-43/I-94 in Milwaukee, WI	1966	current
95Connecticut-3 !I-395	54.69	88.02	I-95 in East Lyme, CT	I-290 in Auburn, MA	1983	current
95Delaware-2 !I‑295	73.77	118.72	I-95/I-495 in New Castle, DE	I-95/US 1 in Lawrence Township, NJ	1994	current
95Delaware-4 !I‑495	11.47	18.46	I-95/I-295 in Newport, DE	I-95 in Lower Chichester Township, PA	1977	current
95Delaware-8 !I‑895	—	—	—	—	1979	1980	Now part of I-95
95DC-2 !I‑295	6.00	9.66	I-95/I-495 near Forest Heights, MD	I-695 in Washington, DC	1964	current
95DC-3 !I‑395	13.39	21.55	I-95/I-495 in Springfield, VA	US 50 in Washington, DC	1977	current	Original route of I-95 that was proposed to continue through Washington, DC
95District-4 !I‑495	31.41	50.55	Beltway around Washington, DC		1961	current	Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
95DC-6 !I‑695	2.00	3.22	I-395 in Washington, DC	I-295 in Washington, DC[16]	1958	current
95Florida-1 !I-195	4.42	7.11	I-95/SR 112 in Miami, FL	SR 905 in Miami Beach, FL	1961	current
95Florida=2 !I-295	61.04	98.23	Beltway around Jacksonville		1970	current
95Florida-3 !I-395	1.29	2.08	I-95	MacArthur Causeway at Watson Island, Miami, FL	1971	current
95Florida-5 !I-595	12.86	20.70	I-75/SR 869 in Weston, FL	US 1 in Fort Lauderdale, FL	1990	current
95Florida-7 !I-795	—	—	Interstate 95 south of Jacksonville	I-295 in Jacksonville	proposed	—	Currently under construction; partially open as SR 9B but not yet signed as I-795
95Maine-1 !I‑195	1.55	2.49	I-95/Maine Tpk. in Saco, ME	SR 5 in Saco, ME	1980	current
95Maine-2 !I‑295	53.11	85.47	I-95/Maine Tpk. in Scarborough, ME	I-95/Maine Tpk. in Gardiner, ME	1960	current
95Maine-3 !I‑395	4.99	8.03	I-95/US 2/SR 100 in Bangor, ME	US 1A in Brewer, ME	2008	current
95Maine-4 !I‑495	3.70	5.95	I-95/Maine Tpk. in Portland, ME	I-295/US 1 in Falmouth, ME	2004	current	Unsigned
95Maryland-1 !I-195	4.71[17]	7.58	I-95/MD 166 near Catonsville, MD	Baltimore-Washington International Airport	1990	current
95Maryland-3 !I-395	1.98	3.19	I-95 in South Baltimore, MD	West Pratt Street in Baltimore, MD	1981	current
95Maryland-5 !I-595	19.97	32.14	I-95/I-495/US 50 near Washington, DC	US 50/US 301/MD 70 in Annapolis, MD	2011	current	Unsigned designation for US 50
95Maryland-6 !I-695	30.57	49.20	Beltway around Baltimore		1958	current
95Maryland-7 !I-795	8.99	14.47	I-695 in Pikesville, MD	MD 140 in Reisterstown, MD	1985	current
95Maryland-8 !I-895	11.44	18.41	I-95 near Elkridge, MD	I-95 in Baltimore, MD	1979	current
95DC-2 !I‑295	8.05	12.96	I-95/I-495 near Forest Heights, MD	I-695 in Washington, DC	1964	current
95Massachusetts-1 !I‑195	44.55	71.70	I-95 in Providence, RI	I-495/Route 25 in Wareham, MA	1958	current
95Massachusetts-2 !I‑295	26.58	42.78	I-95 in Warwick, RI	I-95 in Attleboro, MA	1969	current
95Massachusetts-4 !I‑495	121.56	195.63	I-195/Route 25 in Wareham, MA	I-95 in Salisbury, MA	1957	current
95Massachusetts-6 !I‑695	—	—	I-93 in Roxbury, Boston	I-93 in Charlestown, Boston	1955	1971	Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
95Massachusetts-8 !I‑895	—	—	Route 37/I-295 in Cranston	I-95/I-295 in Attleboro	1968	1982	Cancelled; would have supplemented Interstate 295 to create a full beltway around Providence.
95New Jersey-1 !I-195	34.17	54.99	I-295 in Hamilton Township, NJ	Route 34 in Wall Township, NJ	1968	current
95-8 !I-895	—	—	I-295 in Burlington, NJ	I-95 in Bristol, PA	1963	1981	Never built
95New York-2 !I-295	7.70	12.39	Hillside Avenue (NY 25)/NY 24 in Queens, NY	Bruckner Interchange in the Bronx, NY	1970	current
95New York-4 !I-495	66.38	106.83	Queens Midtown Tunnel in Manhattan, NY	CR 58 in Riverhead, NY	1958	current
95New York-6 !I-695	1.40	2.25	I-95 in the Bronx, NY	I-295 in the Bronx, NY	1986	current
95New York-8 !I-895	1.12	1.80	I-278 in the Bronx, NY	I-95 in the Bronx, NY	1970	current
95North Carolina-2 !I‑295	—	—	—	—	proposed	—	Planned route around the west side of Fayetteville, NC
95North Carolina-4 !I‑495	4.10	6.60	I-440/US 64/US 64 Bus in Raleigh, NC	I-540/US 64/US 264 in Knightdale, NC	2013	current
95North Carolina-7 !I‑795	25.46	40.97	US 70/US 117 in Goldsboro, NC	I-95/US 264 in Wilson, NC	2007	current
95Pennsylvania-6 !I-695	—	—	I-95 near Philadelphia International Airport	I-95 in Philadelphia	1964	1977	Never built
95Virginia-1 !I‑195	3.24	5.21	SR 195 in Richmond, VA	I-64/I-95 in Richmond, VA	1970	current
95Virginia-2 !I‑295	52.56	84.59	I-95 near Petersburg, VA	I-64 near Short Pump, VA	1980	current
95Virginia-5 !I‑595	—	—	I-395 near Arlington, VA	U.S. Route 1 at Ronald Reagan Washington National Airport	—	—	Now part of U.S. Route 1.
95Virginia-8 !I‑895	—	—	I-95 near Richmond	I-295 near Richmond	1996	2002	Currently designated as State Route 895, it was originally planned as a Interstate designation, but did not get approved by AASHTO.
96-1-1 !I-196	37.07[11]	59.66	US 31 in Norton Shores, MI	I-96/US 16 in Grand Rapids, MI	1959	1963	Now the western end of I-96
96-1-2 !I-196	80.65	129.79	I-94/US 31 near Benton Harbor, MI	I-96/M-37 in Grand Rapids, MI	1963	current
96-2 !I-296	3.43	5.52	I-196 in Grand Rapids, MI	I-96/M-37 in Walker, MI	1962	current	Unsigned since 1979
96-4 !I-496	11.78	18.96	I-69/I-96 near Lansing, MI	I-96 and US 127 near Lansing, MI	1970	current
96-6 !I-696	29.39	47.30	I-96/I-275 & M-5 in Novi, MI	I-94 in Roseville, MI	1989	current
Former       Future

See also

• U.S. Roads portal

Notes

References

External links

• 3-digit Interstates at Kurumi.com