County ZIP codes · New Hampshire · FIPS 33019
Sullivan County, NH ZIP Codes
Sullivan County, New Hampshire has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 2 for PO boxes or a single organization. 15 of the residential ones lie mainly in Sullivan County and 3 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $56,731 in 03603 (Charlestown) to $110,175 in 03782 (Sunapee) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Sullivan 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 $70,455 and $95,089.
They carry 18 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 18 residential ZIP codes in Sullivan County
15 ZIP codes lie mainly in Sullivan County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 03743 | Claremont | 13,704 | 232 | $60k | $207k | 100% |
| 03773 | Newport | 7,681 | 82 | $81k | $239k | 100% |
| 03603 | Charlestown | 5,238 | 118 | $57k | $230k | 100% |
| 03753 | Grantham | 3,509 | 124 | $106k | $344k | 100% |
| 03782 | Sunapee | 3,122 | 154 | $110k | $412k | 100% |
| 03781 | Plainfield | 1,918 | 40 | $110k | $426k | 100% |
| 03745 | Cornish | 1,816 | 43 | $92k | $296k | 100% |
| 03280 | Washington | 1,224 | 27 | $90k | $355k | 100% |
| 03752 | Goshen | 1,042 | 47 | $70k | $256k | 100% |
| 03605 | Lempster | 907 | 29 | $86k | $239k | 100% |
| 03284 | Springfield | 890 | 23 | $113k | $364k | 100% |
| 03770 | Meriden | 604 | 137 | $154k | $594k | 100% |
| 03751 | Georges Mills | 397 | 199 | – | – | 100% |
| 03601 | Acworth | 382 | 24 | $81k | $262k | 100% |
| 03607 | South Acworth | 368 | 22 | $84k | $265k | 100% |
Partly in Sullivan County
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?
3 ZIP codes of Sullivan County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Sullivan | Elsewhere |
|---|---|---|
| 03748 | 5% | Grafton County 95% |
| 03257 | 3% | Merrimack County 97% |
| 03602 | 37% | Cheshire County 63% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 03746 | Cornish Flat |
| 03754 | Guild |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Sullivan County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Sullivan County's ZIP codes use 3 prefixes: 032, 036 and 037.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 032 | Manchester, NH (SCF 030) | 3 | 64 |
| 036 | White Riv Jct, VT (SCF 050) | 5 | 8 |
| 037 | White Riv Jct, VT (SCF 050) | 12 | 29 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.