15 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Islip | Suffolk County | 340,300 |
| Irondequoit | Monroe County | 50,485 |
| Ithaca | Tompkins County | 34,665 |
| Ithaca | Tompkins County | 20,881 |
| Ilion | Herkimer County | 7,532 |
| Irvington | Westchester County | 6,469 |
| Island Park | Nassau County | 5,037 |
| Islandia | Suffolk County | 3,672 |
| Ira | Cayuga County | 2,082 |
| Indian Lake | Hamilton County | 1,366 |
| Italy | Yates County | 1,100 |
| Independence | Allegany County | 1,086 |
| Ischua | Cattaraugus County | 724 |
| Interlaken | Seneca County | 613 |
| Inlet | Hamilton County | 357 |