South Mount Vernon, Ohio
Census-designated place
South Mount Vernon Show map of Ohio South Mount Vernon Show map of the United States
Coordinates: 40°22′52″N 82°29′57″W / 40.38111°N 82.49917°W / 40.38111; -82.49917
Country	United States
State	Ohio
County	Knox
Township	Clinton
Area [1]
• Total	0.51 sq mi (1.31 km2)
• Land	0.51 sq mi (1.31 km2)
• Water	0.00 sq mi (0.00 km2)
Elevation [2]	1,017 ft (310 m)
Population  (2020)
• Total	714
• Density	1,413.86/sq mi (545.57/km2)
Time zone	UTC-5 (Eastern (EST))
• Summer (DST)	UTC-4 (EDT)
ZIP Code	43050 (Mount Vernon)
Area code(s)	740/220
FIPS code	39-73530
GNIS feature ID	2806994[2]

South Mount Vernon is a census-designated place (CDP) in Knox County, Ohio, United States, adjacent to the city of Mount Vernon. It was first listed as a CDP prior to the 2020 census.^[2]

The CDP is west of the center of Knox County, in Clinton Township. It is bordered to the north, east, and south by the city of Mount Vernon. It is bordered to the southeast by Dry Creek, a northeast-flowing tributary of the Kokosing River, part of the Walhonding River and subsequently Muskingum River watersheds leading to the Ohio River.

U.S. Route 36 (Harcourt Road) runs through the west side of the community, leading north and east into Mount Vernon, and southwest 22 miles (35 km) to Sunbury.