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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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Knox County ZIP Codes

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

County State ZIP Code City Area Codes
Knox County NE 68786 Wausa 402, 531
Knox County NE 68789 Winnetoon 402, 531
Knox County OH 43005 Bladensburg 220, 740
Knox County OH 43011 Centerburg 220, 419, 567, 740
Knox County OH 43014 Danville 220, 234, 330, 419, 567, 740
Knox County OH 43019 Fredericktown 220, 419, 567, 740
Knox County OH 43022 Gambier 220, 740
Knox County OH 43028 Howard 220, 740
Knox County OH 43037 Martinsburg 220, 740
Knox County OH 43048 Mount Liberty 740
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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.