17 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 13357 | Ilion | 10,301 |
| 13350 | Herkimer | 9,695 |
| 13365 | Little Falls | 8,449 |
| 13340 | Frankfort | 7,479 |
| 13407 | Mohawk | 5,140 |
| 13416 | Newport | 2,235 |
| 13431 | Poland | 1,939 |
| 13324 | Cold Brook | 1,653 |
| 13338 | Forestport | 1,242 |
| 13420 | Old Forge | 1,092 |
| 13322 | Clayville | 1,073 |
| 13454 | Salisbury Center | 732 |
| 13361 | Jordanville | 661 |
| 13406 | Middleville | 492 |
| 13472 | Thendara | 340 |
| 13331 | Eagle Bay | 69 |
| 13475 | Van Hornesville | 39 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 17 ZCTAs in Herkimer County, New York (US Census).