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	51031	Le Mars	Plymouth County	`712`
IA	51033	Linn Grove	Buena Vista County	`712`
IA	51034	Mapleton	Monona County	`712`
IA	51035	Marcus	Cherokee County	`712`
IA	51036	Maurice	Sioux County	`712`
IA	51037	Meriden	Cherokee County	`712`
IA	51038	Merrill	Plymouth County	`712`
IA	51039	Moville	Woodbury County	`712`
IA	51040	Onawa	Monona County	`402, 531, 712`
IA	51041	Orange City	Sioux 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.