| Locality | Post Code |
|---|---|
| Big Moose, Herkimer | 13331 |
| Cedarville, Herkimer | 13357 |
| Cold Brook, Herkimer | 13324 |
| Columbia, Herkimer | 13357 |
| Dennison Corners, Herkimer | 13407 |
| Dolgeville, Herkimer | 13329 |
| Eagle Bay, Herkimer | 13331 |
| East Herkimer, Herkimer | 13350 |
| East Winfield, Herkimer | 13491 |
| Fairfield, Herkimer | 13406 |
| Fort Herkimer, Herkimer | 13407 |
| Frankfort, Herkimer | 13340 |
| German Flatts, Herkimer | 13407 |
| Grant, Herkimer | 13324 |
| Gravesville, Herkimer | 13431 |
| Gray, Herkimer | 13324 |
| Herkimer, Herkimer | 13350 |
| Ilion, Herkimer | 13357 |
| Jordanville, Herkimer | 13361 |
| Little Falls, Herkimer | 13365 |
| Manheim, Herkimer | 13329 |
| Middleville, Herkimer | 13406 |
| Millers Mills, Herkimer | 13491 |
| Mohawk, Herkimer | 13407 |
| Morehouseville, Herkimer | 13324 |
| Newport, Herkimer | 13416 |