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	50136	Keswick	Keokuk County	`319, 641`
IA	50137	Killduff	Jasper County	`641`
IA	50138	Knoxville	Marion County	`515, 641`
IA	50139	Lacona	Warren County	`515, 641`
IA	50140	Lamoni	Decatur County	`641, 660`
IA	50141	Laurel	Marshall County	`641`
IA	50142	Le Grand	Marshall County	`641`
IA	50143	Leighton	Mahaska County	`641`
IA	50144	Leon	Decatur County	`641`
IA	50145	Liberty Center	Warren County	`641`

Page 11 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.