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	50432	Crystal Lake	Hancock County	`641`
IA	50433	Dougherty	Cerro Gordo County	`641`
IA	50434	Fertile	Worth County	`641`
IA	50435	Floyd	Floyd County	`641`
IA	50436	Forest City	Winnebago County	`641`
IA	50438	Garner	Hancock County	`641`
IA	50439	Goodell	Hancock County	`641`
IA	50440	Grafton	Worth County	`641`
IA	50441	Hampton	Franklin County	`515, 641`
IA	50444	Hanlontown	Worth County	`641`

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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.