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	51350	Melvin	Osceola County	`712`
IA	51351	Milford	Dickinson County	`712`
IA	51354	Ocheyedan	Osceola County	`507, 712`
IA	51355	Okoboji	Dickinson County	`712`
IA	51357	Royal	Clay County	`712`
IA	51358	Ruthven	Palo Alto County	`712`
IA	51360	Spirit Lake	Dickinson County	`507, 712`
IA	51363	Superior	Dickinson County	`712`
IA	51364	Terril	Dickinson County	`712`
IA	51365	Wallingford	Emmet 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.