List of Interstate Highways in Texas

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A map of all Interstate Highways in Texas

This is a list of Interstate Highways in Texas, all of which are owned and maintained by the U.S. state of Texas.^[1] The Texas Department of Transportation (TxDOT) is the state agency responsible for the day-to-day maintenance and operations of the Interstate Highways in Texas. The Interstate Highway System in Texas covers 3,233.4 miles (5,203.7 km) and consists of nine primary routes, six auxiliary routes and the splitting of Interstate 35 (I-35) into two branches, I-35E and I-35W, that provide access to both Fort Worth and Dallas. The Interstate Highway with the longest segment in Texas is I-10 at 878.6 miles (1,414.0 km). The shortest Interstate Highway in the state is I-110 at 0.9 miles (1.4 km).

The construction of the Interstate Highway System in Texas actually began well before these routes were designated as Interstate Highways. A 50-mile (80 km) stretch of the Gulf Freeway (I-45) between Galveston and Houston was opened in 1951, eight years before it was designated I-45. It was also the first urban expressway in Texas. In 1962, 43 miles (69 km) of I-35 opened in Bexar County, the first section of Interstate Highway to open from county line to county line in a large metropolitan area.^[2] Portions of I-10 west of San Antonio took much longer to complete due to the vast open spaces and lack of nearby labor. The majority of the construction of this section of I-10 occurred in the 1970s and 1980s and was complete by the early 1990s. The section east of San Antonio was completed 20 years earlier in 1972.^[3] The opening of a 6-mile (10 km) section of I-27 in 1992 completed the Interstate Highway System in Texas.^[4]

Planning is ongoing for a proposed extension of I-69 southward from its current terminus in Indiana through Texas to the United States-Mexico border.^[5] If built, I-69 will extend about 650 miles (1,050 km) across Texas, from the Louisiana state line in the Texarkana-Shreveport area to South Texas.^[6]

1 Primary Interstate Highways
2 Auxiliary Interstate Highways
3 References

[edit] Primary Interstate Highways

Highway	Location	Length	Description	Date established	Notes
I-10	El Paso, Hudspeth, Jeff Davis, Reeves, Pecos, Crockett, Sutton, Kimble, Kerr, Gillespie, Kendall, Bexar, Guadalupe, Caldwell, Gonzales, Fayette, Colorado, Austin, Waller, Harris, Chambers, Jefferson and Orange counties	878.6 miles (1,414.0 km)	I-10 enters the state from New Mexico northwest of El Paso, passing through rural West Texas on its way to San Antonio, where it has junctions with I-35 and I-37. It continues east to Houston, where it has a junction with I-45, then enters Louisiana near Orange. I-10 is the state's longest Interstate Highway as well as its southernmost east-west Interstate Highway.^[7]	1959	^[8]
I-20	Reeves, Ward, Crane, Ector, Midland, Martin, Howard, Mitchell, Nolan, Taylor, Callahan, Eastland, Erath, Palo Pinto, Parker, Tarrant, Dallas, Kaufman, Van Zandt, Smith, Gregg and Harrison counties	&0000000000000636.1.0E+5636.1 miles (1,023.7 km)	I-20 begins at exit 186 on I-10 in West Texas and heads towards the northeast. The highway is a major east-west corridor through the Dallas–Fort Worth Metroplex, the Dallas and Fort Worth combined metropolitan areas, where it has junctions with I-30, I-35W, I-35E and I-45. I-20 passes through East Texas before it enters Louisiana east of Marshall.^[9]	1959	^[10]
I-27	Lubbock, Hale, Swisher, Randall and Potter counties	&0000000000000124.1.0E+5124.1 miles (199.8 km)	I-27 begins at Loop 289 in southern Lubbock and heads north in the Texas Panhandle. It ends at exit 70 on I-40 in Amarillo.^[11]	1969	^[12]
I-30	Parker, Tarrant, Dallas, Rockwall, Hunt, Hopkins, Franklin, Titus, Morris and Bowie counties	&0000000000000223.7.0E+5223.7 miles (360.1 km)	I-30 begins at exit 421 on I-20 in the western portions of the Dallas–Fort Worth Metroplex, the Dallas and Fort Worth combined metropolitan areas. As it heads east through the Metroplex, it has junctions with I-35W, I-35E and I-45. After leaving the Metroplex, the highway heads towards the east-northeast and enters Arkansas at Texarkana.^[13]	1959	^[14]
I-35	Webb, La Salle, Frio, Medina, Atascosa, Bexar, Guadalupe, Comal, Hays, Travis, Williamson, Bell, Falls, McLennan, Hill, Denton and Cooke counties	&0000000000000407.2.0E+5407.2 miles (655.3 km)	I-35 begins at the United States-Mexico border in Laredo and heads north towards San Antonio. In San Antonio, it intersects I-10 and I-37 before heading north to Austin, the state capital. North of Hillsboro, the highway splits into two branches, I-35W which heads to Fort Worth and I-35E that heads to Dallas. The two branches reunite in Denton and I-35 heads north, entering Oklahoma north of Gainesville.^[15]^[16]	1959	^[17]
I-35E	Hill, Ellis, Dallas and Denton counties	&0000000000000096.8.0E+596.8 miles (155.7 km)	I-35E is the eastern and less direct branch of I-35 from Hillsboro to Denton; it passes through Dallas, where it intersects I-20 and I-30.^[18]	1959	^[19]
I-35W	Hill, Johnson, Tarrant and Denton counties	&0000000000000085.2.0E+585.2 miles (137.1 km)	I-35W is the western and more direct branch of I-35 from Hillsboro to Denton; it passes through Fort Worth, where it intersects I-20 and I-30.^[20]	1959	^[21]
I-37	Nueces, San Patricio, Live Oak, Atascosa and Bexar counties	&0000000000000143.000000143.0 miles (230.1 km)	I-37 begins in Corpus Christi near the Gulf Coast and heads towards the north-northwest. It intersects I-10 before it ends at exit 158 on I-35 in San Antonio.^[22]	1959	^[23]
I-40	Deaf Smith, Oldham, Potter, Carson, Gray, Donley and Wheeler counties	&0000000000000177.1.0E+5177.1 miles (285.0 km)	I-40 crosses the Texas Panhandle from New Mexico to Oklahoma, and has a junction with I-27 in Amarillo. The alignment of I-40 is the approximate alignment of the historic U.S. Highway 66 (US 66).^[24]	1959	^[25]
I-44	Wichita County	&0000000000000014.8.0E+514.8 miles (23.8 km)	I-44 begins in Wichita Falls and heads north to Oklahoma.^[26]	1982	^[27]
I-45	Galveston, Harris, Montgomery, Walker, Madison, Leon, Freestone, Navarro, Ellis and Dallas counties	&0000000000000284.9.0E+5284.9 miles (458.5 km)	I-45 begins in Galveston at the Gulf Coast and heads north intersecting I-10 in Houston. It passes through East Texas and intersects I-20 before ending at exit 46 on I-30 in Dallas.^[28]	1959	^[29]

I-10 and I-35 run concurrently as an elevated freeway in Downtown San Antonio.

I-10 and I-45 near Downtown Houston

I-37 and I-410 interchange on the southeast side of San Antonio

[edit] Auxiliary Interstate Highways

Highway	Location	Length	Description	Date established	Notes
I-110	El Paso County	0.9 miles (1.4 km)	I-110 is a spur of I-10 at exit 22B in El Paso. It connects I-10 to the Bridge of the Americas, the entry point into Ciudad Juarez, Mexico.^[30]	1967	^[31]
I-345	Dallas County	1.4 miles (2.3 km)	I-345 is a spur beginning at the northern terminus of I-45. The spur is a continuation of I-45, and the highway continues as US 75 beyond the northern terminus of I-345. It provides a connecting route from I-45 to Spur 366 and US 75 in Dallas.^[32]	1964	^[33]
I-410	Bexar County	49.5 miles (79.7 km)	I-410, also known as the John Connally Loop, is a loop of I-10 around the city of San Antonio. It also intersects I-35 and I-37.^[34]	1959	^[35]
I-610	Harris County	38.0 miles (61.2 km)	I-610 is a loop of I-10 around the city of Houston. It also intersects I-45.^[36]	1959	^[37]
I-635	Dallas and Tarrant counties	37.0 miles (59.5 km)	I-635, also known as the Lyndon B. Johnson Freeway, is a loop of I-35E. It forms a partial loop around Dallas, and also intersects I-20, I-30, and I-45.^[38]	1959	^[39]
I-820	Tarrant County	35.2 miles (56.6 km)	I-820, also known as the Jim Wright Freeway, is a loop of I-20. It forms the western, northern and eastern arcs of a complete loop around Fort Worth; I-20 forms the southern arc. I-820 also intersects I-30 and I-35W.^[40]	1959	^[41]