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	51442	Denison	Crawford County	`712`
IA	51443	Glidden	Carroll County	`712`
IA	51444	Halbur	Carroll County	`712`
IA	51445	Ida Grove	Ida County	`712`
IA	51446	Irwin	Shelby County	`712`
IA	51447	Kirkman	Shelby County	`712`
IA	51448	Kiron	Crawford County	`712`
IA	51449	Lake City	Calhoun County	`712`
IA	51450	Lake View	Sac County	`712`
IA	51451	Lanesboro	Carroll 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.