Codes.zone

Iowa counties

Every county in Iowa, with the ZIP codes recorded in each. Pick one to see its full ZIP code list.

counties
99
ZIP codes
1,055

All Iowa counties

99
Every Iowa county with the number of ZIP codes it holds and the city holding the most of them.
County ZIP codes Largest city
Adair County 5 Adair
Adams County 4 Carbon
Allamakee County 7 Dorchester
Appanoose County 9 Centerville
Audubon County 6 Audubon
Benton County 15 Atkins
Black Hawk County 13 Waterloo
Boone County 9 Boone
Bremer County 8 Denver
Buchanan County 11 Aurora
Buena Vista County 9 Albert City
Butler County 12 Allison
Calhoun County 10 Farnhamville
Carroll County 12 Arcadia
Cass County 8 Anita
Cedar County 8 Bennett
Cerro Gordo County 11 Mason City
Cherokee County 8 Aurelia
Chickasaw County 7 Alta Vista
Clarke County 3 Murray
Clay County 9 Dickens
Clayton County 15 Edgewood
Clinton County 18 Clinton
Crawford County 12 Arion
Dallas County 15 Adel
Davis County 4 Bloomfield
Decatur County 8 Davis City
Delaware County 10 Colesburg
Des Moines County 7 Burlington
Dickinson County 7 Arnolds Park
Dubuque County 18 Dubuque
Emmet County 5 Armstrong
Fayette County 14 Arlington
Floyd County 7 Charles City
Franklin County 9 Alexander
Fremont County 9 Farragut
Greene County 8 Churdan
Grundy County 9 Beaman
Guthrie County 9 Bagley
Hamilton County 9 Blairsburg
Hancock County 8 Britt
Hardin County 13 Ackley
Harrison County 10 Dunlap
Henry County 10 Hillsboro
Howard County 6 Chester
Humboldt County 11 Bode
Ida County 5 Arthur
Iowa County 13 Amana
Jackson County 12 Andrew
Jasper County 12 Baxter
Jefferson County 6 Fairfield
Johnson County 14 Iowa City
Jones County 10 Anamosa
Keokuk County 15 Delta
Kossuth County 12 Algona
Lee County 11 Argyle
Linn County 31 Cedar Rapids
Louisa County 7 Columbus City
Lucas County 5 Chariton
Lyon County 8 Alvord
Madison County 8 Bevington
Mahaska County 9 Barnes City
Marion County 12 Melcher Dallas
Marshall County 13 Albion
Mills County 8 Emerson
Mitchell County 8 Carpenter
Monona County 9 Blencoe
Monroe County 3 Albia
Montgomery County 6 Red Oak
Muscatine County 10 Atalissa
O'Brien County 8 Archer
Osceola County 5 Ashton
Page County 11 Shenandoah
Palo Alto County 8 Ayrshire
Plymouth County 9 Akron
Pocahontas County 8 Fonda
Polk County 78 Des Moines
Pottawattamie County 19 Council Bluffs
Poweshiek County 8 Brooklyn
Ringgold County 7 Benton
Sac County 8 Auburn
Scott County 22 Davenport
Shelby County 9 Defiance
Sioux County 13 Alton
Story County 18 Ames
Tama County 13 Buckingham
Taylor County 7 Bedford
Union County 7 Afton
Van Buren County 10 Birmingham
Wapello County 7 Agency
Warren County 13 Ackworth
Washington County 8 Ainsworth
Wayne County 8 Allerton
Webster County 14 Badger
Winnebago County 7 Buffalo Center
Winneshiek County 8 Calmar
Woodbury County 24 Sioux City
Worth County 7 Fertile
Wright County 9 Clarion

Scope every county-equivalent recorded in Iowa. Source Census 2024 county Gazetteer (2024 Gazetteer) and GeoNames US postal codes (2026-07 postal dump). Updated . Names and boundaries follow the Census Bureau's current county-equivalent set, not the IA postal source's older names.