State Route 15 Alternate (SR 15 Alt.) is a alternate route of SR 15. It consists of a series of streets, roads, and highways that form a south-to-north-oriented highway in Clarke and Jackson counties in the northeastern part of the state. SR 15 Alt.'s southern terminus is in Athens at the interchange of Milledge Avenue and US 29/US 78/US 129/US 441/SR 8/SR 10 Loop/SR 15 (Athens Perimeter Highway) and Macon Highway. The segment along Milledge Avenue winds by the campus of the University of Georgia. This street features stately homes and mansions, some of which house college fraternities and sororities. SR 15 Alt. follows Prince Avenue northwest after the northern end of Milledge Avenue. As SR 15 Alt. leaves Athens, it becomes concurrent with US 129, where it is known as Jefferson Road. Upon entering Jefferson, SR 15 Alt. splits from US 129 to the northeast and becomes an independent highway. Its northern terminus is in the northeastern part of the city of Commerce at its intersection with US 441 (sometimes referred to as the Commerce Bypass) and SR 59. This intersection is the north end of SR 15 Alt.'s concurrency with US 441 Bus.