| State Route 12 | ||||
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| Route information | ||||
| Maintained by GDOT | ||||
| Major junctions | ||||
| West end: | US 278 / SR 10 in Avondale Estates | |||
| East end: | US 78/US 278/SR 10/SR 17 Bypass at Thomson | |||
| Highway system | ||||
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Georgia State Routes
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State Route 12 begins in Avondale Estates, DeKalb County, Georgia at its intersection with SR 10 and ends at SR 10/US 78 in Thomson, Georgia. State Route 12 overlaps U.S. Route 278 its entire length. It is also concurrent with Interstate 20/SR 402 from Exit 75, which is SR 124 (Turner Hill Road) in Lithonia until it reaches Exit 90 in Covington in Newton County. State Route 12 largely runs parallel to Interstate 20 from DeKalb County, near Atlanta, to McDuffie County.