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.

42,735 verified records
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Baltimore County ZIP Codes

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

County State ZIP Code City Area Codes
Baltimore County MD 21156 Upper Falls 410, 443, 667
Baltimore County MD 21162 White Marsh 410, 443, 667
Baltimore County MD 21204 Towson 410, 443, 667
Baltimore County MD 21207 Gwynn Oak 410, 443, 667
Baltimore County MD 21208 Pikesville 410, 443, 667
Baltimore County MD 21209 Baltimore 410, 443, 667
Baltimore County MD 21219 Sparrows Point 410, 443, 667
Baltimore County MD 21220 Middle River 410, 443, 667
Baltimore County MD 21221 Essex 410, 443, 667
Baltimore County MD 21222 Dundalk 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.