County ZIP codes · New Hampshire · FIPS 33001
Belknap County, NH ZIP Codes
Belknap County, New Hampshire has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 14 residential and 5 for PO boxes or a single organization. 13 of the residential ones lie mainly in Belknap County and 1 mainly in a neighboring county; 2 cross the county line. Median household income ranges from $73,241 in 03246 (Laconia) to $119,712 in 03837 (Gilmanton Iron Works) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Belknap County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $84,719 and $111,660.
They carry 14 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 14 residential ZIP codes in Belknap County
13 ZIP codes lie mainly in Belknap County; 1 more reaches into it from a neighboring county and follows the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 03246 | Laconia | 17,103 | 861 | $73k | $340k | 100% |
| 03249 | Gilford | 7,830 | 202 | $117k | $457k | 100% |
| 03220 | Belmont | 7,393 | 244 | $68k | $316k | 99% |
| 03253 | Meredith | 6,707 | 179 | $85k | $483k | 100% |
| 03225 | Center Barnstead | 3,834 | 138 | $112k | $368k | 100% |
| 03809 | Alton | 3,680 | 92 | $106k | $388k | 100% |
| 03269 | Sanbornton | 3,066 | 62 | $107k | $450k | 100% |
| 03237 | Gilmanton | 2,575 | 68 | $111k | $345k | 100% |
| 03256 | New Hampton | 2,497 | 68 | $88k | $382k | 100% |
| 03810 | Alton Bay | 2,314 | 98 | $148k | $569k | 100% |
| 03837 | Gilmanton Iron Works | 1,451 | 73 | $120k | $410k | 100% |
| 03218 | Barnstead | 1,160 | 76 | $113k | $347k | 100% |
| 03226 | Center Harbor | 1,005 | 73 | $108k | $463k | 100% |
Partly in Belknap County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 03276 | Tilton | 9,015 | 229 | $82k | $273k | 28% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
2 ZIP codes of Belknap County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Belknap | Elsewhere |
|---|---|---|
| 03276 | 28% | Merrimack County 72% |
| 03220 | 99% | Merrimack County 1% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Belknap County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Belknap County's ZIP codes use 2 prefixes: 032 and 038.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.