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	50039	Bouton	Dallas County	`515`
IA	50040	Boxholm	Boone County	`515`
IA	50041	Bradford	Franklin County	`641`
IA	50042	Brayton	Audubon County	`712`
IA	50043	Buckeye	Hardin County	`515`
IA	50044	Bussey	Marion County	`641`
IA	50046	Cambridge	Story County	`515`
IA	50047	Carlisle	Warren County	`515`
IA	50048	Casey	Guthrie County	`515, 641`
IA	50049	Chariton	Lucas County	`641`

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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.