8 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Idabel | McCurtain County | 6,960 |
| Inola | Rogers County | 1,896 |
| Indiahoma | Comanche County | 276 |
| Ingalls | Noble County | 163 |
| Indianola | Pittsburg County | 144 |
| Isabella | Major County | 73 |
| IXL | Okfuskee County | 58 |
| Iron Post | Cherokee County | 45 |