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 50456 Manly Worth County 641
IA 50457 Meservey Cerro Gordo County 641
IA 50458 Nora Springs Floyd County 641
IA 50459 Northwood Worth County 507, 641
IA 50460 Orchard Mitchell County 641
IA 50461 Osage Mitchell County 641
IA 50464 Plymouth Cerro Gordo County 641
IA 50465 Rake Winnebago County 507, 641
IA 50466 Riceville Mitchell County 507, 641
IA 50467 Rock Falls Cerro Gordo 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.