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
All states and U.S. territories
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State directory

Ohio ZIP Codes

Complete postal directory, details, and geographic map for the State of Ohio.

State ZIP Code City County Area Codes
OH 45018 Fairfield Butler County 513
OH 45025 Hamilton Butler County 513
OH 45026 Hamilton Butler County 513
OH 45030 Harrison Hamilton County 283, 513, 812, 930
OH 45032 Harveysburg Warren County 283, 513
OH 45033 Hooven Hamilton County 283, 513
OH 45034 Kings Mills Warren County 283, 513
OH 45036 Lebanon Warren County 283, 326, 513, 937
OH 45039 Maineville Warren County 283, 513
OH 45040 Mason Warren County 283, 513
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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.