Map of Iowa

Click Iowa to zoom in and explore counties. Click any other state to visit its page.

How many counties are in Iowa?

Iowa has 99 counties. The list below includes each county, its FIPS code, and population.

Total counties 99 Current county count for Iowa.

Largest by population Polk County 505,255 residents

Smallest by population Adams County 3,544 residents

Iowa county table

County list for Iowa with county FIPS codes and population totals.

County	State	County FIPS	Population
Polk County	IA	19153	505,255
Linn County	IA	19113	228,972
Scott County	IA	19163	174,270
Johnson County	IA	19103	157,528
Black Hawk County	IA	19013	130,471
Dallas County	IA	19049	111,092
Woodbury County	IA	19193	105,951
Dubuque County	IA	19061	98,887
Story County	IA	19169	98,566
Pottawattamie County	IA	19155	93,179
Warren County	IA	19181	55,205
Clinton County	IA	19045	46,158
Cerro Gordo County	IA	19033	42,406
Muscatine County	IA	19139	42,218
Marshall County	IA	19127	40,014
Des Moines County	IA	19057	38,253
Jasper County	IA	19099	37,919
Webster County	IA	19187	36,485
Sioux County	IA	19167	36,246
Wapello County	IA	19179	35,166
Marion County	IA	19125	33,770
Lee County	IA	19111	32,565
Boone County	IA	19015	26,590
Benton County	IA	19011	25,796
Plymouth County	IA	19149	25,722
Bremer County	IA	19017	25,307
Washington County	IA	19183	22,560
Mahaska County	IA	19123	21,874
Jones County	IA	19105	20,900
Buchanan County	IA	19019	20,691
Buena Vista County	IA	19021	20,567
Carroll County	IA	19027	20,522
Winneshiek County	IA	19191	19,815
Henry County	IA	19087	19,547
Jackson County	IA	19097	19,342
Fayette County	IA	19065	19,210
Poweshiek County	IA	19157	18,453
Cedar County	IA	19031	18,302
Dickinson County	IA	19059	18,056
Delaware County	IA	19055	17,600
Madison County	IA	19121	16,971
Clayton County	IA	19043	16,969
Tama County	IA	19171	16,833
Clay County	IA	19041	16,511
Hardin County	IA	19083	16,463
Iowa County	IA	19095	16,381
Crawford County	IA	19047	16,013
Jefferson County	IA	19101	15,440
Floyd County	IA	19067	15,326
Page County	IA	19145	15,014
Hamilton County	IA	19079	14,729
Harrison County	IA	19085	14,670
Mills County	IA	19129	14,633
Kossuth County	IA	19109	14,396
Butler County	IA	19023	14,172
Allamakee County	IA	19005	14,074
O'Brien County	IA	19141	14,012
Cass County	IA	19029	13,130
Wright County	IA	19197	12,656
Grundy County	IA	19075	12,384
Lyon County	IA	19119	12,324
Appanoose County	IA	19007	12,119
Union County	IA	19175	11,906
Shelby County	IA	19165	11,806
Chickasaw County	IA	19037	11,658
Cherokee County	IA	19035	11,605
Guthrie County	IA	19077	10,722
Hancock County	IA	19081	10,615
Winnebago County	IA	19189	10,571
Mitchell County	IA	19131	10,518
Louisa County	IA	19115	10,513
Montgomery County	IA	19137	10,139
Keokuk County	IA	19107	9,914
Franklin County	IA	19069	9,875
Calhoun County	IA	19025	9,763
Sac County	IA	19161	9,686
Clarke County	IA	19039	9,588
Humboldt County	IA	19091	9,500
Howard County	IA	19089	9,376
Emmet County	IA	19063	9,229
Davis County	IA	19051	9,169
Palo Alto County	IA	19147	8,810
Lucas County	IA	19117	8,747
Greene County	IA	19073	8,584
Monona County	IA	19133	8,493
Decatur County	IA	19053	7,665
Monroe County	IA	19135	7,504
Adair County	IA	19001	7,389
Worth County	IA	19195	7,297
Van Buren County	IA	19177	7,266
Pocahontas County	IA	19151	6,976
Ida County	IA	19093	6,833
Wayne County	IA	19185	6,557
Fremont County	IA	19071	6,458
Osceola County	IA	19143	5,978
Taylor County	IA	19173	5,924
Audubon County	IA	19009	5,534
Ringgold County	IA	19159	4,642
Adams County	IA	19003	3,544

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