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	52245	Iowa City	Johnson County	`319`
IA	52246	Iowa City	Johnson County	`319`
IA	52247	Kalona	Washington County	`319`
IA	52248	Keota	Keokuk County	`319, 641`
IA	52249	Keystone	Benton County	`319`
IA	52251	Ladora	Iowa County	`319`
IA	52252	Langworthy	Jones County	`319`
IA	52253	Lisbon	Linn County	`319, 563`
IA	52254	Lost Nation	Clinton County	`563`
IA	52255	Lowden	Cedar 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.