8 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Idabel | McCurtain County | 6,984 |
| Inola | Rogers County | 1,898 |
| Indiahoma | Comanche County | 273 |
| Ingalls | Noble County | 165 |
| Indianola | Pittsburg County | 142 |
| Isabella | Major County | 129 |
| IXL | Okfuskee County | 60 |
| Iron Post | Cherokee County | 53 |