South Pittsburg
- County:
- Marion County
- County Seat:
- No
- Area (mi²):
- 8.22
- State:
- Tennessee
South Pittsburg is a city located in Marion County, Tennessee. South Pittsburg has a 2026 population of 2,969. South Pittsburg is currently declining at a rate of -0.2% annually and its population has decreased by -3.88% since the most recent census, which recorded a population of 3,089 in 2020.