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	52323	Oxford Junction	Jones County	`563`
IA	52324	Palo	Linn County	`319`
IA	52325	Parnell	Iowa County	`319`
IA	52326	Quasqueton	Buchanan County	`319`
IA	52327	Riverside	Washington County	`319`
IA	52328	Robins	Linn County	`319`
IA	52329	Rowley	Buchanan County	`319`
IA	52330	Ryan	Delaware County	`319, 563`
IA	52332	Shellsburg	Benton County	`319`
IA	52333	Solon	Johnson County	`319, 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.