8 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Irmo | Richland County | 12,315 |
| India Hook | York County | 4,649 |
| Isle Palms | Charleston County | 4,384 |
| Inman | Spartanburg County | 3,410 |
| Irwin | Lancaster County | 1,984 |
| Iva | Anderson County | 1,203 |
| Inman Mills | Spartanburg County | 932 |
| Islandton | Colleton County | 50 |