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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State directory

Connecticut ZIP Codes

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

State ZIP Code City County Area Codes
CT 06438 Haddam Middlesex County 860, 959
CT 06439 Hadlyme New London County 860, 959
CT 06440 Hawleyville Fairfield County 203
CT 06441 Higganum Middlesex County 860, 959
CT 06442 Ivoryton Middlesex County 860, 959
CT 06443 Madison New Haven County 203, 475, 860, 959
CT 06444 Marion Hartford County 203, 475, 860, 959
CT 06447 Marlborough Hartford County 860, 959
CT 06450 Meriden New Haven County 203, 475, 860, 959
CT 06451 Meriden New Haven County 203, 475, 860, 959
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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.