15 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Islip | Suffolk County | 341,430 |
| Irondequoit | Monroe County | 50,590 |
| Ithaca | Tompkins County | 35,562 |
| Ithaca | Tompkins County | 20,548 |
| Ilion | Herkimer County | 7,506 |
| Irvington | Westchester County | 6,436 |
| Island Park | Nassau County | 5,056 |
| Islandia | Suffolk County | 3,693 |
| Ira | Cayuga County | 2,074 |
| Indian Lake | Hamilton County | 1,370 |
| Italy | Yates County | 1,098 |
| Independence | Allegany County | 1,090 |
| Ischua | Cattaraugus County | 728 |
| Interlaken | Seneca County | 610 |
| Inlet | Hamilton County | 356 |