Marion County, South Carolina Cities (2026)

3 cities

City
Rank
2026 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Marion15,9186,368-1.25%1,3224 City
Mullins23,7644,009-1.08%1,1783 City
Sellers31461460%2181 Town

Marion County Cities Summary

Largest City

Marion is the largest city in Marion County, with a population of 5,918.

Smallest City

Sellers is the smallest city in Marion County, with a population of 146.

10 Largest Cities

There are 3 cities in Marion County, South Carolina.

Location of Marion County