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.

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County directory

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 21013 Baldwin 410, 443, 667
Baltimore County MD 21020 Boring 410
Baltimore County MD 21022 Brooklandville 410
Baltimore County MD 21023 Butler 410, 443, 667
Baltimore County MD 21027 Chase 410
Baltimore County MD 21030 Cockeysville 410, 443, 667
Baltimore County MD 21031 Hunt Valley 410, 443, 667
Baltimore County MD 21051 Fork 410, 443, 667
Baltimore County MD 21052 Fort Howard 410, 443, 667
Baltimore County MD 21053 Freeland 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.