Zip Code | City | Population |
|---|---|---|
| 14760 | Olean | 17,675 |
| 14779 | Salamanca | 6,899 |
| 14070 | Gowanda | 6,186 |
| 14706 | Allegany | 6,051 |
| 14042 | Delevan | 4,403 |
| 14737 | Franklinville | 4,105 |
| 14772 | Randolph | 3,993 |
| 14719 | Cattaraugus | 3,398 |
| 14755 | Little Valley | 2,858 |
| 14726 | Conewango Valley | 2,743 |
| 14743 | Hinsdale | 2,171 |
| 14741 | Great Valley | 1,887 |
| 14138 | South Dayton | 1,864 |
| 14101 | Machias | 1,843 |
| 14065 | Freedom | 1,747 |
| 14171 | West Valley | 1,605 |
| 14778 | Saint Bonaventure | 1,380 |
| 14129 | Perrysburg | 1,300 |
| 14731 | Ellicottville | 1,220 |
| 14753 | Limestone | 950 |
| 14729 | East Otto | 813 |
| 14748 | Kill Buck | 505 |
| 14173 | Yorkshire | 188 |
| 14041 | Dayton | 132 |
| 14783 | Steamburg | 128 |
| 14788 | Westons Mills | 104 |
| 14168 | Versailles | 77 |