South Vienna
- County:
- Clark County
- County Seat:
- No
- Area (mi²):
- 0.651
- State:
- Ohio
South Vienna is a village located in Clark County, Ohio. South Vienna has a 2026 population of 407. South Vienna is currently growing at a rate of 0.25% annually but its population has decreased by -0.97% since the most recent census, which recorded a population of 411 in 2020.
The median household income in South Vienna is $69,118 with a poverty rate of 1.73%. The median age in South Vienna is 40.5 years: 37.4 years for males, and 48.4 years for females. For every 100 females there are 90.5 males.