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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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Harford County ZIP Codes

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

County State ZIP Code City Area Codes
Harford County MD 21040 Edgewood 410, 443, 667
Harford County MD 21047 Fallston 410, 443, 667
Harford County MD 21050 Forest Hill 410, 443, 667
Harford County MD 21078 Havre De Grace 410, 443, 667
Harford County MD 21084 Jarrettsville 410, 443, 667
Harford County MD 21085 Joppa 410, 443, 667
Harford County MD 21130 Perryman 410, 443, 667
Harford County MD 21132 Pylesville 223, 410, 443, 667, 717
Harford County MD 21154 Street 410, 443, 667
Harford County MD 21160 Whiteford 223, 410, 443, 667, 717
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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.