First three digits · New Hampshire
ZIP Codes Starting with
10 ZIP codes start with 031, sorted at the Manchester, NH (SCF 030) sectional center (USPS labeling list L005, effective October 1, 2026) in New Hampshire: 7 residential ZIP codes across 2 counties and 3 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 031 mean?
The first digit, 0, is one of ten national areas (Connecticut, Massachusetts, Maine, New Hampshire, New Jersey, Puerto Rico, Rhode Island, Vermont, U.S. Virgin Islands and Armed Forces Europe). The first three, 031, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 031 to the Manchester, NH (SCF 030) facility. The last two digits pick the delivery area. By residents, the largest town names among the 031 ZIP codes are Manchester, Bedford and Hooksett.
The same facility sorts 6 prefixes, 223 ZIP codes in all: 030, 031, 032, 033, 034, 038.
Where are the 031 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 031
| County | ||||||
|---|---|---|---|---|---|---|
| 03101 | Manchester | Hillsborough County | 3,201 | 4,184 | $84k | $429k |
| 03102 | Manchester | Hillsborough County | 33,959 | 3,749 | $74k | $343k |
| 03103 | Manchester | Hillsborough County | 37,775 | 4,112 | $74k | $342k |
| 03104 | Manchester | Hillsborough County | 35,237 | 4,228 | $89k | $392k |
| 03105 | Manchester | Hillsborough County | PO Box or unique | – | – | – |
| 03106 | Hooksett | Merrimack County | 15,032 | 417 | $118k | $408k |
| 03108 | Manchester | Hillsborough County | PO Box or unique | – | – | – |
| 03109 | Manchester | Hillsborough County | 9,929 | 1,370 | $108k | $388k |
| 03110 | Bedford | Hillsborough County | 23,746 | 724 | $167k | $612k |
| 03111 | Manchester | Hillsborough County | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.