13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia | 1 | 146,933 | 136,207 | 1.48% | 1,063 | 138 | City |
| Dentsville | 2 | 16,983 | 15,537 | 1.16% | 2,538 | 7 | CDP |
| Irmo | 3 | 12,234 | 11,491 | 1.22% | 1,741 | 7 | Town |
| Forest Acres | 4 | 10,392 | 10,621 | -0.44% | 2,247 | 5 | City |
| Woodfield | 5 | 9,507 | 9,361 | 0.15% | 3,491 | 3 | CDP |
| Blythewood | 6 | 7,201 | 4,860 | 6.95% | 677 | 11 | Town |
| Capitol View | 7 | 4,364 | 3,604 | 7.14% | 2,700 | 2 | CDP |
| Arthurtown | 8 | 3,759 | 2,793 | 7.16% | 2,020 | 2 | CDP |
| Olympia | 9 | 1,533 | 1,098 | 7.2% | 2,144 | 1 | CDP |
| Hopkins | 10 | 1,452 | 2,068 | -6.14% | 88 | 17 | CDP |
| Gadsden | 11 | 1,308 | 983 | -1.65% | 114 | 12 | CDP |
| Arcadia Lakes | 12 | 853 | 865 | -0.35% | 1,531 | 1 | Town |
| Eastover | 13 | 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 13 cities in Richland County, South Carolina.