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	52045	Epworth	Dubuque County	`563`
IA	52046	Farley	Dubuque County	`563`
IA	52047	Farmersburg	Clayton County	`563`
IA	52048	Garber	Clayton County	`563`
IA	52049	Garnavillo	Clayton County	`563, 608`
IA	52050	Greeley	Delaware County	`563`
IA	52052	Guttenberg	Clayton County	`563, 608`
IA	52053	Holy Cross	Dubuque County	`563`
IA	52054	La Motte	Jackson County	`563`
IA	52056	Luxemburg	Dubuque County	`563`

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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.