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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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Howard County ZIP Codes

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

County State ZIP Code City Area Codes
Howard County MD 20723 Laurel 227, 240, 301, 410, 443, 667
Howard County MD 20759 Fulton 227, 240, 301, 410, 443, 667
Howard County MD 20763 Savage 227, 240, 301
Howard County MD 20777 Highland 227, 240, 301
Howard County MD 20794 Jessup 227, 240, 301, 410, 443, 667
Howard County MD 21029 Clarksville 227, 240, 301, 410, 443, 667
Howard County MD 21036 Dayton 227, 240, 301, 410, 443, 667
Howard County MD 21041 Ellicott City 410
Howard County MD 21042 Ellicott City 410, 443, 667
Howard County MD 21043 Ellicott City 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.