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	51535	Griswold	Cass County	`712`
IA	51536	Hancock	Pottawattamie County	`712`
IA	51537	Harlan	Shelby County	`712`
IA	51540	Hastings	Mills County	`712`
IA	51541	Henderson	Mills County	`712`
IA	51542	Honey Creek	Pottawattamie County	`712`
IA	51543	Kimballton	Audubon County	`712`
IA	51544	Lewis	Cass County	`712`
IA	51545	Little Sioux	Harrison County	`402, 531, 712`
IA	51546	Logan	Harrison 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.