Chester is a small rural city in Chester County, South Carolina, United States. The population was 5,607 at the 2010 census, down from 6,476 at the 2000 census. It is the county seat of Chester County.

South Carolina Highway 9 (SC 9) is a 259.570-mile (418 km) major state highway in the U.S. state of South Carolina. The highway travels from Cherry Grove Beach to the North Carolina state line upstate. The highway is currently the longest state highway in South Carolina. It is signed as a north–south highway, even though it travels in an east–west direction.