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 01851 Lowell Middlesex County 351, 978
MA 01852 Lowell Middlesex County 351, 978
MA 01853 Lowell Middlesex County 351
MA 01854 Lowell Middlesex County 351, 978
MA 01860 Merrimac Essex County 351, 603, 978
MA 01862 North Billerica Middlesex County 351, 978
MA 01863 North Chelmsford Middlesex County 351, 978
MA 01864 North Reading Middlesex County 339, 351, 781, 978
MA 01865 Nutting Lake Middlesex County 351, 978
MA 01866 Pinehurst Middlesex County 351, 978
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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.