15 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Islip town | Suffolk County | 333,694 |
| Irondequoit town | Monroe County | 49,019 |
| Ithaca | Tompkins County | 34,422 |
| Ithaca town | Tompkins County | 20,783 |
| Ilion | Herkimer County | 7,499 |
| Irvington | Westchester County | 6,275 |
| Island Park | Nassau County | 4,996 |
| Islandia | Suffolk County | 3,668 |
| Ira town | Cayuga County | 2,073 |
| Indian Lake town | Hamilton County | 1,346 |
| Italy town | Yates County | 1,107 |
| Independence town | Allegany County | 1,066 |
| Ischua town | Cattaraugus County | 698 |
| Interlaken | Seneca County | 604 |
| Inlet town | Hamilton County | 357 |