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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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 52355 Webster Keokuk County 319, 641
IA 52356 Wellman Washington County 319
IA 52358 West Branch Cedar County 319, 563
IA 52359 West Chester Washington County 319
IA 52361 Williamsburg Iowa County 319
IA 52362 Wyoming Jones County 319, 563
IA 52401 Cedar Rapids Linn County 319
IA 52402 Cedar Rapids Linn County 319
IA 52403 Cedar Rapids Linn County 319
IA 52404 Cedar Rapids Linn County 319
Page 91 of 107

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.