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

Massachusetts ZIP Codes

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

State ZIP Code City County Area Codes
MA 02120 Roxbury Crossing Suffolk County 617, 857
MA 02121 Dorchester Suffolk County 617, 857
MA 02122 Dorchester Suffolk County 617, 857
MA 02123 Boston Suffolk County 617
MA 02124 Dorchester Center Suffolk County 617, 857
MA 02125 Dorchester Suffolk County 617, 857
MA 02126 Mattapan Suffolk County 617, 857
MA 02127 South Boston Suffolk County 617, 857
MA 02128 East Boston Suffolk County 339, 617, 781, 857
MA 02129 Charlestown Suffolk County 617, 857
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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.