State 19 · IA

Iowa county map

Iowa has 99 counties. Kossuth County is the largest by land at 973 square miles, and Polk County is the most populous with 516,185 residents.

Population 2024
3,241,488
#32 of 51
Land area
55,854 sq mi
#23 of 51
Density
58.0 / sq mi
#37 of 51
Counties
99
Capital: Des Moines
N
Des Moines 41.59° N, 93.60° W

Map of all 99 counties in Iowa

Every county is labeled on Census 2024 boundaries. Download it as a PDF to print, a PNG, or an editable SVG. For blank, colored or city versions, see the printable Iowa map sheets.

AdairAdamsAllamakeeAppanooseAudubonBentonBlack HawkBooneBremerBuchananBuena VistaButlerCalhounCarrollCassCedarCerro GordoCherokeeChickasawClarkeClayClaytonClintonCrawfordDallasDavisDecaturDelawareDes MoinesDickinsonDubuqueEmmetFayetteFloydFranklinFremontGreeneGrundyGuthrieHamiltonHancockHardinHarrisonHenryHowardHumboldtIdaIowaJacksonJasperJeffersonJohnsonJonesKeokukKossuthLeeLinnLouisaLucasLyonMadisonMahaskaMarionMarshallMillsMitchellMononaMonroeMontgomeryMuscatineO'BrienOsceolaPagePalo AltoPlymouthPocahontasPolkPottawattamiePoweshiekRinggoldSacScottShelbySiouxStoryTamaTaylorUnionVan BurenWapelloWarrenWashingtonWayneWebsterWinnebagoWinneshiekWoodburyWorthWrightIowa county map. Online Map Tools (onlinemaptools.com), Census 2024 boundaries, free to reuse with credit.
99 units labeled. The orange dot marks the capital.

Iowa population and land area

Iowa had 3,241,488 residents in the Census Vintage 2024 estimates, the sum of its counties. That ranks 32nd of the 50 states and DC. Its 55,854 square miles of land rank 23rd. Iowa averages 58.0 people per square mile of land, about 1.7 times sparser than the national figure of 96.3. By density it ranks 37th.

Population, 2024
3,241,48832nd of 51
Land area
55,854 sq mi23rd of 51
Density
58.0 per sq mi37th of 51
Number of counties
99
Capital
Des Moines41.591° N, 93.604° W
State FIPS code
19

Iowa counties by population, density and income

Each shape is shaded by quintile, darker for higher values. Switch the measure above the map. Select a shape to open that county's page. The pin marks the capital, Des Moines.

Monroe County: 17Worth County: 18Buena Vista County: 36Jasper County: 52Van Buren County: 15Hardin County: 29Ida County: 16Marshall County: 71Fayette County: 26Ringgold County: 8.6Wapello County: 83Webster County: 52Adams County: 8.5Buchanan County: 36Cerro Gordo County: 75Lucas County: 20Emmet County: 23Floyd County: 30Crawford County: 23Linn County: 323Montgomery County: 24Polk County: 901Cherokee County: 20Bremer County: 58Grundy County: 25Adair County: 13Cedar County: 31Story County: 179Mahaska County: 39Davis County: 18Clay County: 29Johnson County: 261Greene County: 15Palo Alto County: 16Benton County: 36Cass County: 23Wright County: 22Audubon County: 13Henry County: 45Boone County: 47Appanoose County: 24Washington County: 40Chickasaw County: 23Poweshiek County: 32Osceola County: 15Wayne County: 13Mitchell County: 23Jefferson County: 36Union County: 28Butler County: 24Hancock County: 19Marion County: 61Delaware County: 30Humboldt County: 22Sioux County: 48Des Moines County: 92O'Brien County: 25Clayton County: 22Black Hawk County: 234Winnebago County: 26Harrison County: 21Decatur County: 14Pocahontas County: 12Lyon County: 21Iowa County: 28Franklin County: 17Dickinson County: 48Madison County: 31Allamakee County: 22Jones County: 37Carroll County: 36Kossuth County: 15Hamilton County: 26Howard County: 20Page County: 28Guthrie County: 18Tama County: 23Monona County: 12Clarke County: 22Lee County: 63Mills County: 34Sac County: 17Scott County: 383Keokuk County: 17Jackson County: 30Warren County: 99Calhoun County: 17Shelby County: 20Fremont County: 13Dubuque County: 163Louisa County: 26Taylor County: 11Woodbury County: 123Clinton County: 66Winneshiek County: 29Pottawattamie County: 98Plymouth County: 30Muscatine County: 96Dallas County: 196
Density
  1. < 17
  2. 17+
  3. 23+
  4. 30+
  5. 52+
no data

Largest county in Iowa by land area

Kossuth County ranks first at 973 square miles and Dickinson County last at 381 square miles. The top value is 2.6 times the bottom one.

  1. 01Kossuth County973
  2. 02Pottawattamie County951
  3. 03Woodbury County873
  4. 04Plymouth County863
  5. 05Clayton County778
  6. 06Sioux County768
  7. 07Fayette County731
  8. 08Jasper County730
  9. 09Tama County721
  10. 10Linn County717

Most populous county in Iowa

Polk County ranks first at 516,185 residents and Adams County last at 3,606 residents. The gap is more than a hundredfold.

  1. 01Polk County516,185
  2. 02Linn County231,762
  3. 03Scott County175,601
  4. 04Johnson County160,080
  5. 05Black Hawk County132,348
  6. 06Dallas County115,343
  7. 07Woodbury County107,257
  8. 08Story County102,498
  9. 09Dubuque County99,242
  10. 10Pottawattamie County93,529

Least populous county in Iowa

The smallest populations, fewest first. Estimates for small counties carry more uncertainty than those for large ones.

  1. 01Adams County3,606
  2. 02Ringgold County4,608
  3. 03Audubon County5,562
  4. 04Taylor County5,825
  5. 05Osceola County6,036
Log scale, so small counties stay visible next to the largest.

Most densely populated county in Iowa

Polk County ranks first at 901.3 people per square mile and Adams County last at 8.5 people per square mile. The gap is more than a hundredfold.

  1. 01Polk County901.3
  2. 02Scott County383.3
  3. 03Linn County323.2
  4. 04Johnson County261.1
  5. 05Black Hawk County233.9
  6. 06Dallas County196.1
  7. 07Story County179.0
  8. 08Dubuque County163.1
  9. 09Woodbury County122.9
  10. 10Warren County98.9
People per square mile of land, log scale.

Highest median household income in Iowa

Dallas County ranks first at $102,189 and Decatur County last at $54,409. The two are within a factor of 1.88.

  1. 01Dallas County$102,189
  2. 02Warren County$92,695
  3. 03Benton County$86,364
  4. 04Sioux County$85,985
  5. 05Madison County$84,509
  6. 06Mills County$82,260
  7. 07Grundy County$81,093
  8. 08Winneshiek County$80,932
  9. 09Dickinson County$80,922
  10. 10Buchanan County$80,402

Towns and cities in Iowa

The Census Vintage 2024 subcounty estimates list 273 incorporated places in Iowa with 1,000 or more residents, holding 2,390,252 people together, or 74% of the state total. 85 of them have 5,000 or more. The northernmost is Lake Park at 43.447° N and the southernmost is Keokuk at 40.410° N. Among places of 5,000+, Tiffin grew fastest from July 2020 to July 2024, by 44.8%.

  1. 01Des Moines213,096
  2. 02Cedar Rapids137,904
  3. 03Davenport100,938
  4. 04Sioux City86,875
  5. 05Ankeny76,727
  6. 06Iowa City76,710
  7. 07West Des Moines73,664
  8. 08Ames69,026
  9. 09Waterloo67,477
  10. 10Council Bluffs62,665
  11. 11Dubuque58,987
  12. 12Urbandale47,759
Largest incorporated places, Vintage 2024 estimates.

Des Moines, the capital

51.6% of Iowa's place population, 1,232,409 of 2,390,252 people, lives in places within 100 miles of Des Moines. That ranks 37th of 51 for how central the capital is.

See all states in the capital radius ranking and the most remote towns ranking. Sunrise and sunset times for Des Moines, month by month, are on the Des Moines daylight page.

States bordering Iowa

Iowa borders 6 states or districts. The nearest neighboring capital is Lincoln, 170 miles WSW of Des Moines in a straight line.

UTM zones in Iowa

The internal points of Iowa's counties fall in UTM zones 14, 15. Zones are 6 degrees of longitude wide, numbered from 180° W: zone = floor((longitude + 180) / 6) + 1. Because Iowa spans 2 zones, no single UTM zone covers the whole state.

All 99 counties in Iowa

Sort by any column. The small orange number marks the top 3 in the state by population.

FIPS
19153Polk County516,185#1573901.3$79,509
19113Linn County231,762#2717323.2$73,079
19163Scott County175,601#3458383.3$77,100
19103Johnson County160,080613261.1$74,665
19013Black Hawk County132,348566233.9$61,558
19049Dallas County115,343588196.1$102,189
19193Woodbury County107,257873122.9$65,984
19169Story County102,498573179.0$71,539
19061Dubuque County99,242608163.1$72,749
19155Pottawattamie County93,52995198.3$70,768
19181Warren County56,34357098.9$92,695
19045Clinton County46,01569566.2$67,095
19033Cerro Gordo County42,49356874.8$63,161
19139Muscatine County42,13243796.3$66,309
19127Marshall County40,39257370.6$64,005
19057Des Moines County38,41141692.3$60,599
19099Jasper County38,10773052.2$72,394
19187Webster County36,90971651.6$63,557
19167Sioux County36,55476847.6$85,985
19179Wapello County35,68143282.6$61,642
19125Marion County34,04855461.4$79,709
19111Lee County32,37651862.6$60,053
19015Boone County26,72957046.9$77,381
19149Plymouth County25,82586329.9$74,765
19011Benton County25,79971636.0$86,364
19017Bremer County25,32843558.2$79,410
19183Washington County22,63156939.8$75,136
19123Mahaska County22,03457138.6$71,332
19105Jones County21,11657636.7$74,193
19021Buena Vista County20,81657536.2$65,671
19019Buchanan County20,73357136.3$80,402
19027Carroll County20,40756935.8$61,806
19191Winneshiek County19,72369028.6$80,932
19097Jackson County19,39063630.5$74,910
19087Henry County19,36143444.6$65,627
19065Fayette County19,15273126.2$62,103
19157Poweshiek County18,45458531.5$73,434
19031Cedar County18,23157931.5$77,777
19059Dickinson County18,15838147.7$80,922
19055Delaware County17,60957830.5$69,339
19121Madison County17,16156130.6$84,509
19043Clayton County16,93177821.7$65,814
19171Tama County16,73872123.2$66,288
19041Clay County16,47456729.0$72,021
19083Hardin County16,46456928.9$67,903
19095Iowa County16,42358628.0$75,419
19047Crawford County16,37871422.9$64,170
19101Jefferson County15,78143636.2$58,146
19145Page County15,03853528.1$60,695
19067Floyd County15,00850130.0$67,582
19079Hamilton County14,85657725.8$71,731
19129Mills County14,71743733.6$82,260
19085Harrison County14,62669721.0$63,139
19109Kossuth County14,40897314.8$66,667
19141O'Brien County14,26057324.9$69,914
19005Allamakee County14,18463922.2$65,586
19023Butler County14,15658024.4$73,033
19029Cass County13,02456423.1$59,509
19197Wright County12,72958021.9$74,189
19075Grundy County12,40550224.7$81,093
19119Lyon County12,37858821.1$74,790
19007Appanoose County12,10649724.3$54,629
19175Union County11,95542428.2$59,066
19165Shelby County11,82159120.0$68,695
19037Chickasaw County11,71950423.2$73,547
19035Cherokee County11,65857720.2$70,197
19077Guthrie County10,77459118.2$78,027
19131Mitchell County10,63246922.7$74,249
19115Louisa County10,63040226.5$76,120
19081Hancock County10,61657118.6$67,979
19189Winnebago County10,38340025.9$65,086
19137Montgomery County10,06342423.7$60,487
19069Franklin County10,02458217.2$71,041
19107Keokuk County9,85557917.0$65,656
19025Calhoun County9,71157017.0$63,597
19091Humboldt County9,61743422.1$72,307
19161Sac County9,53357516.6$72,395
19039Clarke County9,52443122.1$65,162
19089Howard County9,36047319.8$67,552
19051Davis County9,19350218.3$66,410
19063Emmet County9,16239623.1$61,500
19147Palo Alto County8,80956415.6$64,952
19117Lucas County8,75843120.3$59,540
19073Greene County8,66257015.2$63,082
19133Monona County8,42969412.1$59,814
19053Decatur County7,65653214.4$54,409
19001Adair County7,43156913.1$67,873
19135Monroe County7,37343417.0$65,959
19195Worth County7,30740018.3$75,449
19177Van Buren County7,21748514.9$57,666
19151Pocahontas County7,00657712.1$68,654
19093Ida County6,81043215.8$71,238
19185Wayne County6,62252512.6$59,904
19071Fremont County6,49451112.7$72,129
19143Osceola County6,03639915.1$72,569
19173Taylor County5,82553211.0$59,116
19009Audubon County5,56244312.6$64,977
19159Ringgold County4,6085358.6$61,463
19003Adams County3,6064238.5$63,399

Download all 99 counties as CSV

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 Gazetteer, places
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.