6 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia | 1 | 149,078 | 136,207 | 1.46% | 1,070 | 139 | City |
| Irmo | 2 | 12,383 | 11,491 | 1.22% | 1,813 | 7 | Town |
| Forest Acres | 3 | 10,346 | 10,621 | -0.44% | 2,237 | 5 | City |
| Blythewood | 4 | 7,669 | 4,860 | 6.5% | 722 | 11 | Town |
| Arcadia Lakes | 5 | 851 | 865 | -0.23% | 1,528 | 1 | Town |
| Eastover | 6 | 634 | 616 | 0.48% | 522 | 1 | Town |
Columbia is the largest city in Richland County, with a population of 149,078.
Eastover is the smallest city in Richland County, with a population of 634.
There are 6 cities in Richland County, South Carolina.