16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 13367 | Lowville | 8,601 |
| 13620 | Castorland | 2,298 |
| 13648 | Harrisville | 2,236 |
| 13626 | Copenhagen | 2,202 |
| 13327 | Croghan | 2,009 |
| 13433 | Port Leyden | 1,686 |
| 13343 | Glenfield | 1,606 |
| 13368 | Lyons Falls | 1,129 |
| 13473 | Turin | 982 |
| 13325 | Constableville | 918 |
| 13489 | West Leyden | 576 |
| 13665 | Natural Bridge | 465 |
| 13305 | Beaver Falls | 403 |
| 13312 | Brantingham | 228 |
| 13345 | Greig | 217 |
| 13404 | Martinsburg | 159 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Lewis County, New York (US Census).