Counties in Iowa
Iowa has 99 counties. Find yours from your location, or explore the map and the full list with seats, population, time zones and FIPS codes.
Updated · Data: U.S. Census Bureau
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Iowa has 99 counties, home to about 3,195,937 people. Sort the table by any column, or search by name or seat.
Counties99Central time
Most peoplePolk County497,441 residents, 16% of the state
Fewest peopleAdams County3,641 residents
Most crowdedPolk County869 people per sq mi
Largest by landKossuth County972.7 sq mi
Priciest homesDallas Countymedian value $333,400
Iowa county map
Population3.6k7.7k10k13k17k21k39kno data
County explorer: all 99 counties in Iowa
| County | Seat | Population | Land sq mi | People / sq mi | Median home | Time zone | FIPS |
|---|---|---|---|---|---|---|---|
| Polk | Des Moines | 497,441 | 572.7 | 869 | $248,400 | Central | 19153 |
| Linn | Cedar Rapids | 229,463 | 717.0 | 320 | $204,400 | Central | 19113 |
| Scott | Davenport | 174,302 | 458.1 | 380 | $212,500 | Central | 19163 |
| Johnson | Iowa City | 154,881 | 613.0 | 253 | $293,100 | Central | 19103 |
| Black Hawk | Waterloo | 130,693 | 565.8 | 231 | $182,400 | Central | 19013 |
| Woodbury | Sioux City | 105,760 | 872.9 | 121 | $172,000 | Central | 19193 |
| Dallas | Adel | 104,136 | 588.2 | 177 | $333,400 | Central | 19049 |
| Dubuque | Dubuque | 98,948 | 608.3 | 163 | $226,100 | Central | 19061 |
| Story | Nevada | 98,592 | 572.5 | 172 | $243,600 | Central | 19169 |
| Pottawattamie | Council Bluffs | 93,407 | 951.3 | 98 | $183,600 | Central | 19155 |
| Warren | Indianola | 53,484 | 569.7 | 94 | $252,800 | Central | 19181 |
| Clinton | Clinton | 46,383 | 695.0 | 67 | $153,800 | Central | 19045 |
| Cerro Gordo | Mason City | 42,785 | 568.3 | 75 | $154,100 | Central | 19033 |
| Muscatine | Muscatine | 42,735 | 437.4 | 98 | $172,400 | Central | 19139 |
| Marshall | Marshalltown | 39,971 | 572.5 | 70 | $134,100 | Central | 19127 |
| Des Moines | Burlington | 38,597 | 416.1 | 93 | $137,000 | Central | 19057 |
| Jasper | Newton | 37,864 | 730.4 | 52 | $176,800 | Central | 19099 |
| Webster | Fort Dodge | 36,848 | 715.7 | 51 | $138,500 | Central | 19187 |
| Sioux | Orange City | 35,984 | 767.9 | 47 | $235,600 | Central | 19167 |
| Wapello | Ottumwa | 35,265 | 431.8 | 82 | $112,900 | Central | 19179 |
| Marion | Knoxville | 33,551 | 554.5 | 61 | $211,100 | Central | 19125 |
| Lee | Fort Madison and Keokuk | 33,175 | 517.6 | 64 | $123,600 | Central | 19111 |
| Boone | Boone | 26,669 | 570.5 | 47 | $191,200 | Central | 19015 |
| Plymouth | Le Mars | 25,699 | 862.8 | 30 | $218,600 | Central | 19149 |
| Benton | Vinton | 25,698 | 716.1 | 36 | $198,400 | Central | 19011 |
| Bremer | Waverly | 25,118 | 435.5 | 58 | $207,200 | Central | 19017 |
| Washington | Washington | 22,539 | 568.8 | 40 | $199,600 | Central | 19183 |
| Mahaska | Oskaloosa | 22,045 | 570.9 | 39 | $140,900 | Central | 19123 |
| Jones | Anamosa | 20,799 | 575.6 | 36 | $183,400 | Central | 19105 |
| Buena Vista | Storm Lake | 20,684 | 574.9 | 36 | $146,900 | Central | 19021 |
| Carroll | Carroll | 20,677 | 569.5 | 36 | $175,700 | Central | 19027 |
| Buchanan | Independence | 20,645 | 571.1 | 36 | $171,400 | Central | 19019 |
| Henry | Mount Pleasant | 20,228 | 434.3 | 47 | $148,600 | Central | 19087 |
| Winneshiek | Decorah | 19,972 | 689.8 | 29 | $239,000 | Central | 19191 |
| Jackson | Maquoketa | 19,429 | 636.0 | 31 | $170,000 | Central | 19097 |
| Fayette | West Union | 19,393 | 730.8 | 27 | $130,800 | Central | 19065 |
| Poweshiek | Montezuma | 18,582 | 584.9 | 32 | $184,200 | Central | 19157 |
| Cedar | Tipton | 18,427 | 579.5 | 32 | $199,700 | Central | 19031 |
| Dickinson | Spirit Lake | 17,844 | 380.5 | 47 | $251,600 | Central | 19059 |
| Delaware | Manchester | 17,549 | 577.7 | 30 | $168,700 | Central | 19055 |
| Clayton | Elkader | 17,069 | 778.5 | 22 | $155,700 | Central | 19043 |
| Tama | Toledo | 16,982 | 721.0 | 24 | $139,900 | Central | 19171 |
| Madison | Winterset | 16,760 | 561.0 | 30 | $236,900 | Central | 19121 |
| Hardin | Eldora | 16,729 | 569.3 | 29 | $113,000 | Central | 19083 |
| Iowa | Marengo | 16,547 | 586.5 | 28 | $189,800 | Central | 19095 |
| Clay | Spencer | 16,446 | 567.2 | 29 | $171,500 | Central | 19041 |
| Crawford | Denison | 16,289 | 714.2 | 23 | $136,300 | Central | 19047 |
| Jefferson | Fairfield | 15,676 | 435.5 | 36 | $161,200 | Central | 19101 |
| Floyd | Charles City | 15,502 | 500.6 | 31 | $133,300 | Central | 19067 |
| Page | Clarinda | 15,168 | 534.9 | 28 | $120,000 | Central | 19145 |
| Hamilton | Webster City | 14,893 | 576.7 | 26 | $132,300 | Central | 19079 |
| Harrison | Logan | 14,645 | 696.9 | 21 | $165,300 | Central | 19085 |
| Kossuth | Algona | 14,610 | 972.7 | 15 | $135,100 | Central | 19109 |
| Mills | Glenwood | 14,563 | 437.4 | 33 | $228,700 | Central | 19129 |
| Butler | Allison | 14,301 | 580.1 | 25 | $156,500 | Central | 19023 |
| O'Brien | Primghar | 14,103 | 573.0 | 25 | $158,900 | Central | 19141 |
| Allamakee | Waukon | 14,038 | 639.1 | 22 | $171,900 | Central | 19005 |
| Cass | Atlantic | 13,115 | 564.3 | 23 | $133,300 | Central | 19029 |
| Wright | Clarion | 12,817 | 580.4 | 22 | $109,800 | Central | 19197 |
| Grundy | Grundy Center | 12,352 | 501.9 | 25 | $180,500 | Central | 19075 |
| Appanoose | Centerville | 12,242 | 497.3 | 25 | $119,800 | Central | 19007 |
| Lyon | Rock Rapids | 12,087 | 587.6 | 21 | $215,600 | Central | 19119 |
| Union | Creston | 12,038 | 423.6 | 28 | $117,800 | Central | 19175 |
| Chickasaw | New Hampton | 11,868 | 504.3 | 24 | $164,400 | Central | 19037 |
| Shelby | Harlan | 11,757 | 590.8 | 20 | $156,200 | Central | 19165 |
| Cherokee | Cherokee | 11,587 | 576.9 | 20 | $145,100 | Central | 19035 |
| Hancock | Garner | 10,718 | 571.0 | 19 | $129,300 | Central | 19081 |
| Louisa | Wapello | 10,710 | 401.8 | 27 | $137,600 | Central | 19115 |
| Winnebago | Forest City | 10,648 | 400.5 | 27 | $132,300 | Central | 19189 |
| Guthrie | Guthrie Center | 10,646 | 590.6 | 18 | $163,900 | Central | 19077 |
| Mitchell | Osage | 10,548 | 469.3 | 22 | $164,100 | Central | 19131 |
| Montgomery | Red Oak | 10,254 | 424.1 | 24 | $109,900 | Central | 19137 |
| Franklin | Hampton | 9,977 | 582.0 | 17 | $118,500 | Central | 19069 |
| Keokuk | Sigourney | 9,964 | 579.2 | 17 | $112,200 | Central | 19107 |
| Calhoun | Rockwell City | 9,858 | 569.8 | 17 | $114,400 | Central | 19025 |
| Sac | Sac City | 9,759 | 575.0 | 17 | $138,400 | Central | 19161 |
| Clarke | Osceola | 9,690 | 431.1 | 22 | $160,200 | Central | 19039 |
| Humboldt | Dakota City | 9,573 | 434.4 | 22 | $146,900 | Central | 19091 |
| Howard | Cresco | 9,459 | 473.2 | 20 | $133,900 | Central | 19089 |
| Emmet | Estherville | 9,316 | 395.9 | 24 | $106,200 | Central | 19063 |
| Davis | Bloomfield | 9,127 | 502.2 | 18 | $146,000 | Central | 19051 |
| Palo Alto | Emmetsburg | 8,902 | 563.9 | 16 | $119,300 | Central | 19147 |
| Greene | Jefferson | 8,722 | 569.6 | 15 | $140,500 | Central | 19073 |
| Lucas | Chariton | 8,685 | 430.7 | 20 | $117,000 | Central | 19117 |
| Monona | Onawa | 8,619 | 694.1 | 12 | $122,600 | Central | 19133 |
| Decatur | Leon | 7,669 | 531.9 | 14 | $109,500 | Central | 19053 |
| Monroe | Albia | 7,546 | 433.7 | 17 | $135,900 | Central | 19135 |
| Adair | Greenfield | 7,471 | 569.3 | 13 | $140,600 | Central | 19001 |
| Worth | Northwood | 7,380 | 400.1 | 18 | $142,300 | Central | 19195 |
| Van Buren | Keosauqua | 7,236 | 484.8 | 15 | $118,800 | Central | 19177 |
| Pocahontas | Pocahontas | 7,040 | 577.2 | 12 | $93,300 | Central | 19151 |
| Ida | Ida Grove | 6,944 | 431.5 | 16 | $108,800 | Central | 19093 |
| Fremont | Sidney | 6,570 | 511.2 | 13 | $147,500 | Central | 19071 |
| Wayne | Corydon | 6,518 | 525.5 | 12 | $102,300 | Central | 19185 |
| Osceola | Sibley | 6,114 | 398.7 | 15 | $123,800 | Central | 19143 |
| Taylor | Bedford | 5,901 | 531.9 | 11 | $109,700 | Central | 19173 |
| Audubon | Audubon | 5,622 | 443.0 | 13 | $110,400 | Central | 19009 |
| Ringgold | Mount Ayr | 4,664 | 535.5 | 9 | $150,300 | Central | 19159 |
| Adams | Corning | 3,641 | 423.4 | 9 | $116,900 | Central | 19003 |
Which Iowa cities are in more than one county?
- Des Moines: Polk County 99.9%, Warren County 0.1% of residents
- West Des Moines: Polk County 66.4%, Dallas County 33.4%, Warren County 0.3% of residents
- Urbandale: Polk County 74.1%, Dallas County 25.9% of residents
- Clive: Polk County 58.1%, Dallas County 41.9% of residents
- Sheldon: O'Brien County 96.8%, Sioux County 3.2% of residents
- Dyersville: Dubuque County 96.6%, Delaware County 3.4% of residents
- Forest City: Winnebago County 91.4%, Hancock County 8.6% of residents
- Carlisle: Warren County 99.2%, Polk County 0.8% of residents
- Wilton: Muscatine County 99.2%, Cedar County 0.8% of residents
- Postville: Allamakee County 89.7%, Clayton County 10.3% of residents
- Jesup: Buchanan County 94.1%, Black Hawk County 5.9% of residents
- Cascade: Dubuque County 84.8%, Jones County 15.2% of residents
Sources: Census TIGER/Line 2024; ACS 2019-2023 5-year; Wikidata, CC0 (seats); timezone-boundary-builder (time zones). Data as of November 1, 2026. Not affiliated with any government agency.
FAQ
Frequently asked questions
How many counties are in Iowa?
99.
What is the most populated county in Iowa?
Polk County, with about 497,441 people (16% of the state).
What is the least populated county in Iowa?
Adams County, with about 3,641 people.
What is the largest county in Iowa by land?
Kossuth County, 972.7 sq mi of land.
What county am I in, in Iowa?
Use the tool at the top of this page: press Use my current location, or type your city or ZIP code.