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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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Calvert County ZIP Codes

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

County State ZIP Code City Area Codes
Calvert County MD 20714 North Beach 227, 240, 301, 410, 443, 667
Calvert County MD 20732 Chesapeake Beach 227, 240, 301, 410, 443, 667
Calvert County MD 20736 Owings 227, 240, 301, 410, 443, 667
Calvert County MD 20754 Dunkirk 227, 240, 301, 410, 443, 667
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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.