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	50028	Baxter	Jasper County	`641`
IA	50029	Bayard	Guthrie County	`515, 641, 712`
IA	50031	Beaver	Boone County	`515`
IA	50032	Berwick	Polk County	`515`
IA	50033	Bevington	Madison County	`515`
IA	50034	Blairsburg	Hamilton County	`515`
IA	50035	Bondurant	Polk County	`515`
IA	50036	Boone	Boone County	`515`
IA	50037	Boone	Boone County	`515`
IA	50038	Booneville	Dallas County	`515`

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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.