Marion County, South Carolina Cities (2026)

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density (/mi²)
Area (mi²)
Type
Marion15,9656,370-1.05%1,3324 City
Mullins23,8054,015-0.86%1,1913 City
Sellers3145148-0.68%2171 Town

Marion County Cities Summary

Largest City

Marion is the largest city in Marion County, with a population of 5,965.

Smallest City

Sellers is the smallest city in Marion County, with a population of 145.

10 Largest Cities

There are 3 cities in Marion County, South Carolina.

Location of Marion County