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	51334	Estherville	Emmet County	`507, 712`
IA	51338	Everly	Clay County	`712`
IA	51340	Fostoria	Clay County	`712`
IA	51341	Gillett Grove	Clay County	`712`
IA	51342	Graettinger	Palo Alto County	`712`
IA	51343	Greenville	Clay County	`712`
IA	51344	Gruver	Emmet County	`712`
IA	51345	Harris	Osceola County	`507, 712`
IA	51346	Hartley	O'Brien County	`712`
IA	51347	Lake Park	Dickinson County	`507, 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.