11 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| James Island | Charleston County | 12,666 |
| Johnston | Edgefield County | 2,320 |
| Judson | Greenville County | 2,236 |
| Jackson | Aiken County | 1,689 |
| Johnsonville | Florence County | 1,347 |
| Joanna | Laurens County | 1,337 |
| Jonesville | Union County | 798 |
| Jefferson | Chesterfield County | 796 |
| Jacksonboro | Colleton County | 160 |
| Jamestown | Berkeley County | 73 |
| Jenkinsville | Fairfield County | 38 |