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	51020	Galva	Ida County	`712`
IA	51022	Granville	Sioux County	`712`
IA	51023	Hawarden	Sioux County	`605, 712`
IA	51024	Hinton	Plymouth County	`712`
IA	51025	Holstein	Ida County	`712`
IA	51026	Hornick	Woodbury County	`712`
IA	51027	Ireton	Sioux County	`712`
IA	51028	Kingsley	Plymouth County	`712`
IA	51029	Larrabee	Cherokee County	`712`
IA	51030	Lawton	Woodbury 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.