U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
All states and U.S. territories
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State directory

New Hampshire ZIP Codes

Complete postal directory, details, and geographic map for the State of New Hampshire.

State ZIP Code City County Area Codes
NH 03873 Sandown Rockingham County 603
NH 03874 Seabrook Rockingham County 351, 603, 978
NH 03875 Silver Lake Carroll County 603
NH 03878 Somersworth Strafford County 207, 603
NH 03882 Effingham Carroll County 207, 603
NH 03883 South Tamworth Carroll County 603
NH 03884 Strafford Strafford County 603
NH 03885 Stratham Rockingham County 603
NH 03886 Tamworth Carroll County 603
NH 03887 Union Strafford County 603
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Geographic Map of New Hampshire

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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.