State Route 100 (SR 100) is a 136.5-mile-long (219.7 km) state highway that travels south-to-north through portions of Meriwether, Troup, Heard, Carroll, Haralson, Polk, Floyd, and Chattooga counties in the northwestern part of the U.S. state of Georgia. The route begins at US 27 Alt./SR 18/SR 41/SR 109 in Greenville and ends at US 27/SR 1/SR 114 in Summerville.