15 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Islip | Suffolk County | 340,934 |
| Irondequoit | Monroe County | 50,060 |
| Ithaca | Tompkins County | 33,978 |
| Ithaca | Tompkins County | 20,349 |
| Ilion | Herkimer County | 7,452 |
| Irvington | Westchester County | 6,504 |
| Island Park | Nassau County | 5,092 |
| Islandia | Suffolk County | 3,757 |
| Ira | Cayuga County | 2,116 |
| Indian Lake | Hamilton County | 1,325 |
| Independence | Allegany County | 1,074 |
| Italy | Yates County | 1,070 |
| Ischua | Cattaraugus County | 725 |
| Interlaken | Seneca County | 602 |
| Inlet | Hamilton County | 345 |