ZIP code · Somersworth · New Hampshire · United States
ZIP code 03878 — Somersworth
ZIP code 03878 serves Somersworth, New Hampshire.
- Postal code
- 03878Single source Value from one source, not cross-checked.
- City
- Somersworth
- County
- Strafford FIPS 33017
- State
- New Hampshire
- Country
- United States
- Coordinates
- 43.2525, -70.8756 — precision precise (locality)
View on OpenStreetMap - Population
- 12,145 (ZCTA, ACS 5-year)
- Population density
- 1,237 / sq mi
- Land area
- 9.8 sq mi (25.4 km²) (ZCTA, ACS 5-year)
- Median household income
- $79,691
- Per-capita income
- $42,414
- Median age
- 38.3
- Households
- 5,350
- Housing units
- 5,722
- Median home value
- $295,200
- Median gross rent
- $1,410 / month
- Congressional district
- NH-1 (119th Congress)
- USDA hardiness zone
- 6a (-10 to -5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area code
- 603Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 03878 with another ZIP · ZIPs within 25 miles · distance from 03878
Nearby localities
Map of ZIP code 03878
Climate — monthly normals
Warmest month Jul (avg high 82°F), coldest Jan (avg low 15°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 35 | 44 | 57 | 67 | 77 | 82 | 81 | 73 | 60 | 48 | 37 |
| Avg low °F | 15 | 17 | 25 | 35 | 45 | 54 | 60 | 58 | 50 | 39 | 31 | 22 |
| Precip in | 2.5 | 2.2 | 3.7 | 3.7 | 3.5 | 3.9 | 3.5 | 3.2 | 3.4 | 4.4 | 3.9 | 3.3 |
NOAA 1991–2020 climate normals from the nearest station: ROCHESTER SKYHAVEN AP (2.9 mi) · NOAA NCEI
Places in ZIP 03878
- 8 schools
- 3 hospitals & clinics
- 3 doctors & dentists
- 2 pharmacies
- 2 supermarkets
- 20 restaurants & cafés
- 1 bars & pubs
- 10 parks
- 8 playgrounds
- 6 gyms & sports centres
- 1 libraries
- 1 post offices
- 7 places of worship
- 2 banks
- 9 gas stations
- 1 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page