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

Iowa ZIP Codes

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

State ZIP Code City County Area Codes
IA 50599 Woolstock Wright County 515
IA 50601 Ackley Hardin County 319, 641
IA 50602 Allison Butler County 319, 641
IA 50603 Alta Vista Chickasaw County 641
IA 50604 Aplington Butler County 319, 641
IA 50605 Aredale Butler County 641
IA 50606 Arlington Fayette County 563
IA 50607 Aurora Buchanan County 319, 563
IA 50608 Austinville Butler County 641
IA 50609 Beaman Grundy County 319, 641
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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.