State Route 77 (SR 77) is a 103-mile-long (166 km) state highway that travels south-to-north through portions of Hancock, Greene, Oglethorpe, Elbert, and Hart counties in the eastern part of the U.S. state of Georgia.

Hancock County is a county located in the East Central part of the U.S. state of Georgia. As of the 2020 census, the population was 8,735. The county seat is Sparta. The county was created on December 17, 1793, and named for John Hancock, a Founding Father of the American Revolution.