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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 20610 Barstow 410
Calvert County MD 20615 Broomes Island 410, 443, 667
Calvert County MD 20629 Dowell 410, 443, 667
Calvert County MD 20639 Huntingtown 227, 240, 301, 410, 443, 667
Calvert County MD 20657 Lusby 227, 240, 301, 410, 443, 667
Calvert County MD 20676 Port Republic 410, 443, 667
Calvert County MD 20678 Prince Frederick 227, 240, 301, 410, 443, 667
Calvert County MD 20685 Saint Leonard 227, 240, 301, 410, 443, 667
Calvert County MD 20688 Solomons 227, 240, 301, 410, 443, 667
Calvert County MD 20689 Sunderland 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.