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
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Massachusetts ZIP Codes

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

State ZIP Code City County Area Codes
MA 02420 Lexington Middlesex County 339, 781
MA 02421 Lexington Middlesex County 339, 617, 781, 857
MA 02445 Brookline Norfolk County 617, 857
MA 02446 Brookline Norfolk County 617, 857
MA 02447 Brookline Village Norfolk County 617
MA 02451 Waltham Middlesex County 339, 781
MA 02452 Waltham Middlesex County 339, 617, 781, 857
MA 02453 Waltham Middlesex County 339, 617, 781, 857
MA 02454 Waltham Middlesex County 339
MA 02455 North Waltham Middlesex County 339
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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.