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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Iowa ZIP Codes

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

State ZIP Code City County Area Codes
IA 50586 Somers Calhoun County 515, 712
IA 50588 Storm Lake Buena Vista County 712
IA 50590 Swea City Kossuth County 515
IA 50591 Thor Humboldt County 515
IA 50592 Truesdale Buena Vista County 712
IA 50593 Varina Pocahontas County 712
IA 50594 Vincent Webster County 515
IA 50595 Webster City Hamilton County 515
IA 50597 West Bend Palo Alto County 515, 712
IA 50598 Whittemore Kossuth County 515, 712
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Geographic Map of Iowa

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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.