- Adair
- Adams
- Allamakee
- Appanoose
- Audubon
- Benton
- Black Hawk
- Boone
- Bremer
- Buchanan
- Buena Vista
- Butler
- Calhoun
- Carroll
- Cass
- Cedar
- Cerro Gordo
- Cherokee
- Chickasaw
- Clarke
- Clay
- Clayton
- Clinton
- Crawford
- Dallas
- Davis
- Decatur
- Delaware
- Des Moines
- Dickinson
- Dubuque
- Emmet
- Fayette
- Floyd
- Franklin
- Fremont
- Greene
- Grundy
- Guthrie
- Hamilton
- Hancock
- Hardin
- Harrison
- Henry
- Howard
- Humboldt
- Ida
- Iowa
- Jackson
- Jasper
- Jefferson
- Johnson
- Jones
- Keokuk
- Kossuth
- Lee
- Linn
- Louisa
- Lucas
- Lyon
- Madison
- Mahaska
- Marion
- Marshall
- Mills
- Mitchell
- Monona
- Monroe
- Montgomery
- Muscatine
- O'Brien
- Osceola
- Page
- Palo Alto
- Plymouth
- Pocahontas
- Polk
- Pottawattamie
- Poweshiek
- Ringgold
- Sac
- Scott
- Shelby
- Sioux
- Story
- Tama
- Taylor
- Union
- Van Buren
- Wapello
- Warren
- Washington
- Wayne
- Webster
- Winnebago
- Winneshiek
- Woodbury
- Worth
- Wright
Counties by State
All the counties in Iowa (IA)
Click on one of the county names below, or use the search box to find the zip code information you need.
US Zip Code Information: