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	52630	Hillsboro	Henry County	`319`
IA	52631	Houghton	Lee County	`319`
IA	52632	Keokuk	Lee County	`217, 319, 447, 660`
IA	52635	Lockridge	Jefferson County	`319, 641`
IA	52637	Mediapolis	Des Moines County	`319`
IA	52638	Middletown	Des Moines County	`319`
IA	52639	Montrose	Lee County	`319`
IA	52640	Morning Sun	Louisa County	`319`
IA	52641	Mount Pleasant	Henry County	`319`
IA	52642	Rome	Henry County	`319`

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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.