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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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Mahaska County ZIP Codes

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

County State ZIP Code City Area Codes
Mahaska County IA 50027 Barnes City 641
Mahaska County IA 50143 Leighton 641
Mahaska County IA 50207 New Sharon 641
Mahaska County IA 52534 Beacon 641
Mahaska County IA 52543 Cedar 641
Mahaska County IA 52561 Fremont 641
Mahaska County IA 52577 Oskaloosa 641
Mahaska County IA 52586 Rose Hill 641
Mahaska County IA 52595 University Park 641

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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.