County ZIP codes · New Hampshire · FIPS 33007
Coos County, NH ZIP Codes
Coos County, New Hampshire has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 15 residential and 1 for PO boxes or a single organization. 14 of the residential ones lie mainly in Coos County and 1 mainly in a neighboring county; 1 cross the county line. Median household income ranges from $45,180 in 03570 (Berlin) to $71,538 in 03588 (Milan) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Coos 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 $46,250 and $67,179.
They carry 15 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 15 residential ZIP codes in Coos County
14 ZIP codes lie mainly in Coos County; 1 more reaches into it from a neighboring county and follows the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 03570 | Berlin | 9,383 | 68 | $45k | $131k | 100% |
| 03584 | Lancaster | 3,501 | 56 | $67k | $210k | 100% |
| 03598 | Whitefield | 3,396 | 55 | $67k | $228k | 100% |
| 03581 | Gorham | 3,246 | 21 | $64k | $196k | 100% |
| 03576 | Colebrook | 2,764 | 16 | $53k | $215k | 100% |
| 03582 | Groveton | 1,949 | 24 | $46k | $122k | 100% |
| 03588 | Milan | 1,633 | 15 | $72k | $254k | 100% |
| 03590 | North Stratford | 1,297 | 12 | $53k | $167k | 100% |
| 03592 | Pittsburg | 1,054 | 3 | $61k | $280k | 100% |
| 03583 | Jefferson | 1,013 | 18 | $67k | $297k | 100% |
| 03595 | Twin Mountain | 648 | 18 | $65k | $259k | 100% |
| 03597 | West Stewartstown | 527 | 12 | $56k | – | 100% |
| 03593 | Randolph | 465 | 3 | $102k | $407k | 100% |
| 03575 | Bretton Woods | 11 | 0 | – | – | 100% |
Partly in Coos County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 03579 | Errol | 431 | 1 | $61k | $291k | 42% |
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?
1 ZIP code of Coos County extends into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Coos | Elsewhere |
|---|---|---|
| 03579 | 42% | Oxford County 58% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 03589 | Mount Washington |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Coos County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Coos County starts with 035.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 035 | White Riv Jct, VT (SCF 050) | 16 | 21 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.