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County ZIP codes · New Hampshire · FIPS 33017

Strafford County, NH ZIP Codes

Strafford County, New Hampshire has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 16 residential and 4 for PO boxes or a single organization. 1 of the residential ones extends into a neighboring county. Median household income ranges from $66,982 in 03835 (Farmington) to $148,365 in 03823 (Madbury) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Strafford County?

03820 · Dover: $95k03823 · Madbury: $148k03824 · Durham: $124k03825 · Barrington: $110k03835 · Farmington: $67k03839 · Rochester: $88k03851 · Milton: $93k03852 · Milton Mills: $155k03855 · New Durham: $100k03861 · Lee: $132k03867 · Rochester: $79k03868 · Rochester: $82k03869 · Rollinsford: $87k03878 · Somersworth: $75k03884 · Strafford: $122k03887 · Union: $92k0388403825038670383503855038200385103823038240388703861038680387803839038520386903820 · Dover: $95k03823 · Madbury: $148k03824 · Durham: $124k03825 · Barrington: $110k03835 · Farmington: $67k03839 · Rochester: $88k03851 · Milton: $93k03852 · Milton Mills: $155k03855 · New Durham: $100k03861 · Lee: $132k03867 · Rochester: $79k03868 · Rochester: $82k03869 · Rollinsford: $87k03878 · Somersworth: $75k03884 · Strafford: $122k03887 · Union: $92k038840382503867038350385503820038510382403887038610386803878038390386903820 · Dover: $95k03823 · Madbury: $148k03824 · Durham: $124k03825 · Barrington: $110k03835 · Farmington: $67k03839 · Rochester: $88k03851 · Milton: $93k03852 · Milton Mills: $155k03855 · New Durham: $100k03861 · Lee: $132k03867 · Rochester: $79k03868 · Rochester: $82k03869 · Rollinsford: $87k03878 · Somersworth: $75k03884 · Strafford: $122k03887 · Union: $92k0388403825038670383503855038200385103824038610386803878
The residential ZIP codes of Strafford County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

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 $78,674 and $110,323.

They carry 14 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 16 residential ZIP codes in Strafford County

Residential ZIP codes mainly in Strafford County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
03820 Dover 33,440 1,226 $95k $436k 100%
03867 Rochester 22,732 800 $79k $274k 100%
03824 Durham 15,080 673 $124k $504k 100%
03878 Somersworth 12,205 1,244 $75k $318k 100%
03825 Barrington 9,489 202 $110k $399k 100%
03835 Farmington 6,804 185 $67k $290k 100%
03868 Rochester 6,133 701 $82k $269k 100%
03861 Lee 4,576 232 $132k $481k 100%
03851 Milton 4,333 165 $93k $314k 100%
03884 Strafford 4,306 88 $122k $428k 100%
03839 Rochester 4,279 544 $88k $336k 100%
03855 New Durham 2,748 67 $100k $339k 100%
03869 Rollinsford 2,456 367 $87k $414k 100%
03823 Madbury 2,203 189 $148k $477k 100%
03887 Union 1,739 92 $92k $293k 95%
03852 Milton Mills 205 30 $155k $357k 100%

Download the 20 ZIP codes as CSV

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 Strafford County extends into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Strafford County and in the neighboring counties
ZIPIn StraffordElsewhere
0388795%Carroll County 5%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Strafford County without a residential area (GeoNames postal codes)
ZIPPostal name
03815Center Strafford
03821Dover
03822Dover
03866Rochester

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Strafford 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 Strafford County starts with 038.

Three-digit prefixes of Strafford County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Strafford County's
PrefixSectional centerHereAll codes
038 Manchester, NH (SCF 030) 20 77

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.