6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia | 1 | 146,933 | 136,207 | 1.48% | 1,054 | 139 | City |
| Irmo | 2 | 12,234 | 11,491 | 1.22% | 1,791 | 7 | Town |
| Forest Acres | 3 | 10,392 | 10,621 | -0.44% | 2,247 | 5 | City |
| Blythewood | 4 | 7,201 | 4,860 | 6.95% | 677 | 11 | Town |
| Arcadia Lakes | 5 | 853 | 865 | -0.35% | 1,531 | 1 | Town |
| Eastover | 6 | 631 | 616 | 0.48% | 520 | 1 | Town |
Columbia is the largest city in Richland County, with a population of 146,933.
Eastover is the smallest city in Richland County, with a population of 631.
There are 6 cities in Richland County, South Carolina.