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.

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New London County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in New London County.

County State ZIP Code City Area Codes
New London County CT 06340 Groton 860, 959
New London County CT 06349 Groton 860
New London County CT 06350 Hanover 860, 959
New London County CT 06351 Jewett City 860, 959
New London County CT 06353 Montville 860, 959
New London County CT 06355 Mystic 860, 959
New London County CT 06357 Niantic 860, 959
New London County CT 06359 North Stonington 401, 860, 959
New London County CT 06360 Norwich 860, 959
New London County CT 06365 Preston 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.