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

Maps and coordinates

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	50611	Bristow	Butler County	`641`
IA	50612	Buckingham	Tama County	`319`
IA	50613	Cedar Falls	Black Hawk County	`319`
IA	50614	Cedar Falls	Black Hawk County	`319`
IA	50616	Charles City	Floyd County	`641`
IA	50619	Clarksville	Butler County	`319, 641`
IA	50620	Colwell	Floyd County	`641`
IA	50621	Conrad	Grundy County	`319, 641`
IA	50622	Denver	Bremer County	`319`
IA	50623	Dewar	Black Hawk County	`319`

Page 41 of 107

Geographic Map of Iowa

Postal context

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.