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Counties in Iowa, United States

County Name Population Water Area
Percentage
Land Area
Percentage
Adair County, IA 8,243  0.18%  99.82% 
Adams County, IA 4,482  0.44%  99.56% 
Allamakee County, IA 14,675  2.91%  97.09% 
Appanoose County, IA 13,721  3.89%  96.11% 
Audubon County, IA 6,830  0.1%  99.9% 
Benton County, IA 25,308  0.29%  99.71% 
Black Hawk County, IA 128,012  0.84%  99.16% 
Boone County, IA 26,224  0.36%  99.64% 
Bremer County, IA 23,325  0.39%  99.61% 
Buchanan County, IA 21,093  0.36%  99.64% 
Buena Vista County, IA 20,411  0.91%  99.09% 
Butler County, IA 15,305  0.2%  99.8% 
Calhoun County, IA 11,115  0.37%  99.63% 
Carroll County, IA 21,421  0.16%  99.84% 
Cass County, IA 14,684  0.12%  99.88% 
Cedar County, IA 18,187  0.42%  99.58% 
Cerro Gordo County, IA 46,447  1.18%  98.82% 
Cherokee County, IA 13,035  0.03%  99.97% 
Chickasaw County, IA 13,095  0.17%  99.83% 
Clarke County, IA 9,133  0.14%  99.86% 
Clay County, IA 17,372  0.63%  99.37% 
Clayton County, IA 18,678  1.77%  98.23% 
Clinton County, IA 50,149  2.14%  97.86% 
Crawford County, IA 16,942  0.09%  99.91% 
Dallas County, IA 40,750  0.89%  99.11% 
Davis County, IA 8,541  0.33%  99.67% 
Decatur County, IA 8,689  0.29%  99.71% 
Delaware County, IA 18,404  0.21%  99.79% 
Des Moines County, IA 42,351  3.18%  96.82% 
Dickinson County, IA 16,424  5.61%  94.39% 
Dubuque County, IA 89,143  1.36%  98.64% 
Emmet County, IA 11,027  1.65%  98.35% 
Fayette County, IA 22,008  0.07%  99.93% 
Floyd County, IA 16,900  0.15%  99.85% 
Franklin County, IA 10,704  0.1%  99.9% 
Fremont County, IA 8,010  1.1%  98.9% 
Greene County, IA 10,366  0.48%  99.52% 
Grundy County, IA 12,369  0.01%  99.99% 
Guthrie County, IA 11,353  0.41%  99.59% 
Hamilton County, IA 16,438  0.13%  99.87% 
Hancock County, IA 12,100  0.35%  99.65% 
Hardin County, IA 18,812  0.12%  99.88% 
Harrison County, IA 15,666  0.6%  99.4% 
Henry County, IA 20,336  0.51%  99.49% 
Howard County, IA 9,932  0.08%  99.92% 
Humboldt County, IA 10,381  0.3%  99.7% 
Ida County, IA 7,837  0.12%  99.88% 
Iowa County, IA 15,671  0.15%  99.85% 
Jackson County, IA 20,296  2.1%  97.9% 
Jasper County, IA 37,213  0.4%  99.6% 
Jefferson County, IA 16,181  0.32%  99.68% 
Johnson County, IA 111,006  1.42%  98.58% 
Jones County, IA 20,221  0.24%  99.76% 
Keokuk County, IA 11,400  0.13%  99.87% 
Kossuth County, IA 17,163  0.14%  99.86% 
Lee County, IA 38,052  3.97%  96.03% 
Linn County, IA 191,701  0.98%  99.02% 
Louisa County, IA 12,183  3.77%  96.24% 
Lucas County, IA 9,422  0.84%  99.17% 
Lyon County, IA 11,763  0.02%  99.98% 
Madison County, IA 14,019  0.21%  99.79% 
Mahaska County, IA 22,335  0.44%  99.56% 
Marion County, IA 32,052  2.86%  97.14% 
Marshall County, IA 39,311  0.12%  99.88% 
Mills County, IA 14,547  0.71%  99.29% 
Mitchell County, IA 10,874  0.1%  99.9% 
Monona County, IA 10,020  0.82%  99.18% 
Monroe County, IA 8,016  0.16%  99.84% 
Montgomery County, IA 11,771  0.22%  99.78% 
Muscatine County, IA 41,722  2.32%  97.68% 
O'Brien County, IA 15,102  0.03%  99.97% 
Osceola County, IA 7,003  0.18%  99.82% 
Page County, IA 16,976  0.1%  99.9% 
Palo Alto County, IA 10,147  0.98%  99.02% 
Plymouth County, IA 24,849  0.05%  99.95% 
Pocahontas County, IA 8,662  0.25%  99.75% 
Polk County, IA 374,601  3.81%  96.19% 
Pottawattamie County, IA 87,704  0.59%  99.41% 
Poweshiek County, IA 18,815  0.19%  99.81% 
Ringgold County, IA 5,469  0.23%  99.77% 
Sac County, IA 11,529  0.44%  99.56% 
Scott County, IA 158,668  2.19%  97.81% 
Shelby County, IA 13,173  0.09%  99.91% 
Sioux County, IA 31,589  0.09%  99.91% 
Story County, IA 79,981  0.15%  99.85% 
Tama County, IA 18,103  0.15%  99.85% 
Taylor County, IA 6,958  0.16%  99.84% 
Union County, IA 12,309  0.37%  99.63% 
Van Buren County, IA 7,809  1.17%  98.83% 
Wapello County, IA 36,051  0.96%  99.04% 
Warren County, IA 40,671  0.27%  99.73% 
Washington County, IA 20,670  0.36%  99.64% 
Wayne County, IA 6,730  0.28%  99.72% 
Webster County, IA 40,235  0.39%  99.61% 
Winnebago County, IA 11,723  0.27%  99.73% 
Winneshiek County, IA 21,310  0.04%  99.96% 
Woodbury County, IA 103,877  0.55%  99.45% 
Worth County, IA 7,909  0.43%  99.57% 
Wright County, IA 14,334  0.31%  99.69% 


State Information Safety and Environment
Official Site of Iowa
State Population: 3,107,126
Iowa Counties
Natural Resource Office