There are 16 zip codes in Strafford County, New Hampshire. The most populated is 3820, located in Dover. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
03820Dover32,925
03867Rochester22,349
03824Durham15,073
03878Somersworth12,088
03825Barrington9,339
03835Farmington6,777
03868Rochester6,368
03861Lee4,547
03884Strafford4,261
03851Milton4,195
03839Rochester3,856
03855New Durham2,711
03869Rollinsford2,427
03823Madbury2,213
03887Union1,954
03852Milton Mills314

Strafford County, New Hampshire Zip Codes by Population (2024)