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	51232	Ashton	Osceola County	`712`
IA	51234	Boyden	Sioux County	`712`
IA	51235	Doon	Lyon County	`712`
IA	51237	George	Lyon County	`712`
IA	51238	Hospers	Sioux County	`712`
IA	51239	Hull	Sioux County	`712`
IA	51240	Inwood	Lyon County	`605, 712`
IA	51241	Larchwood	Lyon County	`507, 605, 712`
IA	51242	Lester	Lyon County	`712`
IA	51243	Little Rock	Lyon County	`507, 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.