| State Route 120 | ||||
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| Route information | ||||
| Maintained by GDOT | ||||
| Length: | 75 mi[1] (121 km) | |||
| Major junctions | ||||
| West end: | SR 100 near Tallapoosa | |||
| US 278 / SR 6 in Dallas SR 92 in Hiram SR 5 / SR 120 Alt. in Marietta US 41 / SR 3 in Marietta SR 3 Conn. / SR 120 Alt. in Marietta US 19 / SR 400 in Alpharetta I-85 / SR 403 near Lawrenceville |
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| East end: | US 29 / SR 8 in Lawrenceville | |||
| Highway system | ||||
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Georgia State Routes
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State Route 120 begins at SR 100 near Tallapoosa and ends at West Crogan Street (U.S. 29/SR 8) in Lawrenceville.
In Marietta, SR 120 has a spur route (SR 120 Alternate), which acts as a perimeter for the northern part city. In Paulding County, the highway cosigns with the following highways (SR 360). Then it cosigns with (U.S. 278) through Dallas. In western Paulding County and eastern Haralson County, SR 120 cosigns with (SR 113). While in northern Fulton County, it cosigns with (SR 9) and (SR 140) although SR 140 just briefly cosigns the highway in Roswell.
From 1969 to 2007, SR 120 Loop looped around Marietta. In October 2007, SR 120 Loop was decommissioned, and mainline SR 120 was rerouted to the southern part of the loop. Prior to October 2007, mainline SR 120 ran through downtown Marietta and formed the southern part of Marietta Square. The portion of SR 120 from U.S. 41/SR 3 to SR 120 Alternate was renumbered SR 3 Connector. This was done at the same time changes were made to SR 5.