Belknap County, New Hampshire ZIP codes
18 ZIP codes are in Belknap County, plus 2 that cross in from neighboring counties. It's part of the Laconia, NH micro area.
- ZIP codes
- 18
- Population in these ZIPs
- 60,615
- Avg. median income
- $93,200population-weighted
- Cities & towns
- 16
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Belknap County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 03218 | Barnstead | 1,160 | $112,500 | $463,400 |
| 03220 | Belmont | 7,393 | $68,242 | $461,200 |
| 03225 | Center Barnstead | 3,834 | $111,660 | $449,100 |
| 03226 | Center Harbor | 1,005 | $107,500 | $718,800 |
| 03237 | Gilmanton | 2,575 | $111,359 | $453,600 |
| 03246 | Laconia | 17,103 | $73,241 | $437,600 |
| 03247 PO Box | Laconia | — | — | — |
| 03249 | Gilford | 7,830 | $116,635 | $545,300 |
| 03252 PO Box | Lochmere | — | — | — |
| 03253 | Meredith | 6,707 | $84,719 | $688,000 |
| 03256 | New Hampton | 2,497 | $87,917 | $490,000 |
| 03269 | Sanbornton | 3,066 | $107,083 | $543,600 |
| 03289 PO Box | Winnisquam | — | — | — |
| 03298 PO Box | Tilton | — | — | — |
| 03299 PO Box | Tilton | — | — | — |
| 03809 | Alton | 3,680 | $106,397 | $530,400 |
| 03810 | Alton Bay | 2,314 | $148,261 | $678,400 |
| 03837 | Gilmanton Iron Works | 1,451 | $119,712 | $509,000 |
ZIP codes partly in Belknap County
These ZIP codes are mostly in a neighboring county but cover part of Belknap County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 03254 | Moultonborough | Carroll County | 5,172 | $106,440 | $726,900 |
| 03276 | Tilton | Merrimack County | 9,015 | $82,425 | $428,600 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Belknap County
Nearby counties
Frequently asked questions
How many ZIP codes are in Belknap County, New Hampshire?
18 ZIP codes are mainly in Belknap County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Belknap County?
ZIP codes in Belknap County use the city names Alton, Alton Bay, Barnstead, Belmont, Center Barnstead, Center Harbor, Gilford, Gilmanton, Gilmanton Iron Works, Laconia, Lochmere and Meredith and others.
What metro area is Belknap County in?
Belknap County is part of the Laconia, NH micropolitan statistical area.