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	51525	Carson	Pottawattamie County	`712`
IA	51526	Crescent	Pottawattamie County	`402, 531, 712`
IA	51527	Defiance	Shelby County	`712`
IA	51528	Dow City	Crawford County	`712`
IA	51529	Dunlap	Harrison County	`712`
IA	51530	Earling	Shelby County	`712`
IA	51531	Elk Horn	Shelby County	`712`
IA	51532	Elliott	Montgomery County	`712`
IA	51533	Emerson	Mills County	`712`
IA	51534	Glenwood	Mills 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.