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	51366	Webb	Clay County	`712`
IA	51401	Carroll	Carroll County	`712`
IA	51430	Arcadia	Carroll County	`712`
IA	51431	Arthur	Ida County	`712`
IA	51432	Aspinwall	Crawford County	`712`
IA	51433	Auburn	Sac County	`712`
IA	51436	Breda	Carroll County	`712`
IA	51439	Charter Oak	Crawford County	`712`
IA	51440	Dedham	Carroll County	`712`
IA	51441	Deloit	Crawford County	`712`

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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.