Georgia State Route 15
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| Maintained by GDOT | ||||
| Length: | 346.0 mi (556.8 km) | |||
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| South end: |
    US 1 / US 23 / US 301 / SR 15 and  SR 4 at Florida state line near Folkston
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| North end: |
 US 23 / US 441 at the North Carolina state line in Dillard
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| Location | ||||
| Counties: | Charlton, Brantley, Pierce, Appling, Toombs, Montgomery, Treutlen, Emanuel, Johnson, Washington, Hancock, Greene, Oconee, Clarke, Jackson, Banks, Habersham, Rabun | |||
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| Location: | Athens–Commerce |
| Length: | 31.6 mi (50.9 km) |
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| Location: | Cornelia |
| Length: | 0.70 mi (1.1 km) |
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| Location: | Tallulah Falls |
| Length: | 1.2 mi (1.9 km) |
State Route 15 (SR 15) is a 346-mile-long (557 km) state highway that travels south-to-north across the entire length of the U.S. state of Georgia, east of its centerline. It connects the Florida state line, south-southeast of Folkston with the North Carolina state line, in Dillard, via Folkston, Vidalia, Sandersville, Athens, Demorest, and Clayton.
SR 15 enters Georgia just south of Folkston as a four-lane highway, along with US 1, US 23, US 301, and SR 4. In Homeland, US 301 branches off to the north while the other four routes plus SR 121, head northwest. After about 10 miles (16 km), SR 15 and SR 121 also branch off from US 1/US 23/SR 4, as a two-lane highway, crossing US 82/SR 520 (South Georgia Parkway) in Hoboken. The two state routes continue northwest through Blackshear, where they cross US 84/SR 38. After that, the two state routes continue to stay together, heading north through the community of Bristol. Soon after, SR 121 branches off to the north while SR 15 heads northwest to rejoin US 1 and SR 4 at Baxley. North of Baxley, the three highways continue, remaining a four-lane highway all the way to the Altamaha River. Approximately 10 miles (16 km) past the river crossing, SR 15 branches off to the northwest again, where SR 29 begins and follows SR 15. At Vidalia, SR 15 and SR 29 turn west and follow US 280/SR 30 for several miles to the community of Higgston. The two highways head north from there through the community of Tarrytown and then on to Soperton. SR 29 heads northwest of Soperton while SR 15, along with SR 78, continues north, reaching an interchange with I-16, and goes to Adrian. The two state routes continue northwest to Wrightsville, where SR 78 departs eastward. SR 15 continues by itself through the adjacent cities of Tennille and Sandersville. Through these cites, most of SR 15 has been widened to four lanes, and it briefly picks up SR 24. North of Sandersville, SR 15 crosses the Fall Line Freeway and then heads north through the community of Warthen and onto Sparta. Through Sparta, SR 15 makes a few turns, briefly picking up SR 16 and SR 22. North of Sparta, it picks up SR 77, and continues north through White Plains and Siloam. At Siloam, SR 15 has an interchange with I-20. SR 77 departs to the north while SR 15 continues northwest to Greensboro, passing beneath I-20, but without direct access. In Greensboro, SR 15 makes two more turns, briefly following US 278/SR 12 through downtown. SR 15 continues northwest to Watkinsville, after which it joins US 129/US 441. It travels together with US 441 as a mostly four-lane highway throughout the rest of their course in Georgia.
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