| City | County | 2026 Pop. ↓ |
|---|---|---|
| Jamestown | Chautauqua County | 27,450 |
| Johnson City | Broome County | 14,457 |
| Johnstown | Fulton County | 7,982 |
| Johnstown | Fulton County | 6,627 |
| Jerusalem | Yates County | 4,491 |
| Jay | Essex County | 2,463 |
| Johnsburg | Warren County | 2,123 |
| Java | Wyoming County | 1,932 |
| Jackson | Washington County | 1,705 |
| Jasper | Steuben County | 1,379 |
| Junius | Seneca County | 1,361 |
| Jefferson | Schoharie County | 1,332 |
| Jordan | Onondaga County | 1,187 |
| Jewett | Greene County | 852 |
| Jeffersonville | Sullivan County | 390 |