How many counties in Iowa? All 99 listed
Quick answer
Iowa has 99 counties and county equivalents holding 3,195,937 residents. The most populous county in Iowa is Polk County with 497,441 residents; the smallest is Adams County. County boundaries divide the state's land area — measured in square miles by the Census Bureau — into the units used for property assessment, elections and local sales tax. The statewide sales tax base rate is 6%, before county and city add-ons.
All 99 counties
Ranked by population, Census 2019-2023 ACS 5-year estimates.
| County | Population | Median income | Median home value | Median rent |
|---|---|---|---|---|
| Polk County | 497,441 | $81,621 | $248,400 | $1,113 |
| Linn County | 229,463 | $76,421 | $204,400 | $915 |
| Scott County | 174,302 | $76,363 | $212,500 | $958 |
| Johnson County | 154,881 | $74,721 | $293,100 | $1,104 |
| Black Hawk County | 130,693 | $64,581 | $182,400 | $962 |
| Woodbury County | 105,760 | $70,147 | $172,000 | $946 |
| Dallas County | 104,136 | $102,349 | $333,400 | $1,239 |
| Dubuque County | 98,948 | $75,919 | $226,100 | $944 |
| Story County | 98,592 | $69,006 | $243,600 | $1,019 |
| Pottawattamie County | 93,407 | $71,446 | $183,600 | $970 |
| Warren County | 53,484 | $92,990 | $252,800 | $975 |
| Clinton County | 46,383 | $65,177 | $153,800 | $825 |
| Cerro Gordo County | 42,785 | $65,537 | $154,100 | $840 |
| Muscatine County | 42,735 | $69,512 | $172,400 | $966 |
| Marshall County | 39,971 | $72,785 | $134,100 | $860 |
| Des Moines County | 38,597 | $60,662 | $137,000 | $908 |
| Jasper County | 37,864 | $70,128 | $176,800 | $822 |
| Webster County | 36,848 | $68,054 | $138,500 | $762 |
| Sioux County | 35,984 | $84,736 | $235,600 | $888 |
| Wapello County | 35,265 | $60,034 | $112,900 | $950 |
| Marion County | 33,551 | $78,059 | $211,100 | $880 |
| Lee County | 33,175 | $59,803 | $123,600 | $814 |
| Boone County | 26,669 | $79,741 | $191,200 | $826 |
| Plymouth County | 25,699 | $81,600 | $218,600 | $865 |
| Benton County | 25,698 | $84,742 | $198,400 | $815 |
| Bremer County | 25,118 | $83,343 | $207,200 | $844 |
| Washington County | 22,539 | $71,339 | $199,600 | $862 |
| Mahaska County | 22,045 | $69,019 | $140,900 | $821 |
| Jones County | 20,799 | $73,071 | $183,400 | $759 |
| Buena Vista County | 20,684 | $66,564 | $146,900 | $835 |
| Carroll County | 20,677 | $68,528 | $175,700 | $722 |
| Buchanan County | 20,645 | $78,430 | $171,400 | $802 |
| Henry County | 20,228 | $64,604 | $148,600 | $770 |
| Winneshiek County | 19,972 | $75,652 | $239,000 | $800 |
| Jackson County | 19,429 | $71,605 | $170,000 | $800 |
| Fayette County | 19,393 | $58,764 | $130,800 | $813 |
| Poweshiek County | 18,582 | $64,837 | $184,200 | $864 |
| Cedar County | 18,427 | $79,080 | $199,700 | $860 |
| Dickinson County | 17,844 | $74,570 | $251,600 | $930 |
| Delaware County | 17,549 | $76,205 | $168,700 | $743 |
| Clayton County | 17,069 | $62,326 | $155,700 | $764 |
| Tama County | 16,982 | $67,955 | $139,900 | $865 |
| Madison County | 16,760 | $89,542 | $236,900 | $938 |
| Hardin County | 16,729 | $64,906 | $113,000 | $814 |
| Iowa County | 16,547 | $72,185 | $189,800 | $722 |
| Clay County | 16,446 | $64,082 | $171,500 | $798 |
| Crawford County | 16,289 | $65,039 | $136,300 | $727 |
| Jefferson County | 15,676 | $56,824 | $161,200 | $881 |
| Floyd County | 15,502 | $64,500 | $133,300 | $672 |
| Page County | 15,168 | $57,752 | $120,000 | $731 |
| Hamilton County | 14,893 | $71,750 | $132,300 | $853 |
| Harrison County | 14,645 | $77,027 | $165,300 | $854 |
| Kossuth County | 14,610 | $65,656 | $135,100 | $859 |
| Mills County | 14,563 | $87,810 | $228,700 | $888 |
| Butler County | 14,301 | $69,651 | $156,500 | $780 |
| O'Brien County | 14,103 | $68,216 | $158,900 | $770 |
| Allamakee County | 14,038 | $66,000 | $171,900 | $717 |
| Cass County | 13,115 | $61,657 | $133,300 | $769 |
| Wright County | 12,817 | $64,033 | $109,800 | $788 |
| Grundy County | 12,352 | $83,617 | $180,500 | $777 |
| Appanoose County | 12,242 | $51,146 | $119,800 | $779 |
| Lyon County | 12,087 | $72,881 | $215,600 | $802 |
| Union County | 12,038 | $56,813 | $117,800 | $683 |
| Chickasaw County | 11,868 | $73,421 | $164,400 | $779 |
| Shelby County | 11,757 | $67,690 | $156,200 | $810 |
| Cherokee County | 11,587 | $64,478 | $145,100 | $711 |
| Hancock County | 10,718 | $70,212 | $129,300 | $784 |
| Louisa County | 10,710 | $80,223 | $137,600 | $797 |
| Winnebago County | 10,648 | $63,719 | $132,300 | $712 |
| Guthrie County | 10,646 | $79,981 | $163,900 | $823 |
| Mitchell County | 10,548 | $68,704 | $164,100 | $739 |
| Montgomery County | 10,254 | $63,190 | $109,900 | $782 |
| Franklin County | 9,977 | $63,648 | $118,500 | $649 |
| Keokuk County | 9,964 | $60,856 | $112,200 | $822 |
| Calhoun County | 9,858 | $66,875 | $114,400 | $690 |
| Sac County | 9,759 | $70,991 | $138,400 | $643 |
| Clarke County | 9,690 | $66,821 | $160,200 | $836 |
| Humboldt County | 9,573 | $66,994 | $146,900 | $731 |
| Howard County | 9,459 | $67,336 | $133,900 | $699 |
| Emmet County | 9,316 | $65,181 | $106,200 | $731 |
| Davis County | 9,127 | $79,505 | $146,000 | $878 |
| Palo Alto County | 8,902 | $68,963 | $119,300 | $599 |
| Greene County | 8,722 | $59,159 | $140,500 | $774 |
| Lucas County | 8,685 | $67,921 | $117,000 | $738 |
| Monona County | 8,619 | $62,944 | $122,600 | $795 |
| Decatur County | 7,669 | $57,146 | $109,500 | $663 |
| Monroe County | 7,546 | $72,518 | $135,900 | $787 |
| Adair County | 7,471 | $66,176 | $140,600 | $730 |
| Worth County | 7,380 | $76,875 | $142,300 | $703 |
| Van Buren County | 7,236 | $60,183 | $118,800 | $686 |
| Pocahontas County | 7,040 | $63,423 | $93,300 | $743 |
| Ida County | 6,944 | $62,841 | $108,800 | $669 |
| Fremont County | 6,570 | $73,750 | $147,500 | $753 |
| Wayne County | 6,518 | $59,118 | $102,300 | $660 |
| Osceola County | 6,114 | $69,138 | $123,800 | $796 |
| Taylor County | 5,901 | $67,279 | $109,700 | $707 |
| Audubon County | 5,622 | $54,152 | $110,400 | $707 |
| Ringgold County | 4,664 | $69,821 | $150,300 | $745 |
| Adams County | 3,641 | $68,828 | $116,900 | $909 |
Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year
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