Belknap County ZIP Codes
Belknap County is a county of New Hampshire.
- ZIP codes
- 19
- Cities & towns
- 16
- Area codes
- 1
- Land area
- 402 sq mi
Every ZIP code in Belknap County
| ZIP code | City |
|---|---|
| 03218 | Barnstead |
| 03220 | Belmont |
| 03225 | Center Barnstead |
| 03226 | Center Harbor |
| 03237 | Gilmanton |
| 03246 | Laconia |
| 03247 | Laconia |
| 03249 | Gilford |
| 03252 | Lochmere |
| 03253 | Meredith |
| 03256 | New Hampton |
| 03269 | Sanbornton |
| 03276 | Tilton |
| 03289 | Winnisquam |
| 03298 | Tilton |
| 03299 | Tilton |
| 03809 | Alton |
| 03810 | Alton Bay |
| 03837 | Gilmanton Iron Works |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Belknap County codes above are listed without a column we would have to invent.
Cities and towns in Belknap County
A further 11 places in Belknap County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Belknap County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Belknap County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Belknap County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.