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 52581 Plano Appanoose County 641
IA 52583 Promise City Wayne County 641
IA 52584 Pulaski Davis County 641, 660
IA 52585 Richland Keokuk County 319, 641
IA 52586 Rose Hill Mahaska County 641
IA 52588 Selma Van Buren County 319, 641
IA 52590 Seymour Wayne County 641, 660
IA 52591 Sigourney Keokuk County 319, 641
IA 52593 Udell Appanoose County 641
IA 52594 Unionville Appanoose County 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.