17 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 13357 | Ilion | 10,167 |
| 13350 | Herkimer | 9,522 |
| 13365 | Little Falls | 8,578 |
| 13340 | Frankfort | 7,404 |
| 13407 | Mohawk | 5,042 |
| 13416 | Newport | 2,369 |
| 13431 | Poland | 1,847 |
| 13324 | Cold Brook | 1,729 |
| 13338 | Forestport | 1,280 |
| 13322 | Clayville | 1,172 |
| 13420 | Old Forge | 1,055 |
| 13454 | Salisbury Center | 735 |
| 13361 | Jordanville | 725 |
| 13406 | Middleville | 486 |
| 13472 | Thendara | 259 |
| 13331 | Eagle Bay | 204 |
| 13475 | Van Hornesville | 44 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 17 ZCTAs in Herkimer County, New York (US Census).