Iowa statistical areas

The U.S. currently has 31 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated seven combined statistical areas, nine metropolitan statistical areas, and 15 micropolitan statistical areas in Iowa. As of 2025, the largest of these is the Des Moines–West Des Moines–Ames, IA CSA, comprising the area around Iowa's capital and largest city, Des Moines.

+The 31 United States statistical areas and 99 counties of the State of IowaCombined statistical area2025 population (est.)Core-based statistical area2025 population (est.)County2025 population (est.)Des Moines–West Des Moines–Ames, IA CSA942,701Des Moines–West Des Moines, IA MSA758,539Polk County, Iowa516,546Dallas County, Iowa118,457Warren County, Iowa57,331Jasper County, Iowa38,153Madison County, Iowa17,270Guthrie County, Iowa10,782Ames, IA MSA128,090Story County, Iowa101,291Boone County, Iowa26,799Pella, IA μSA34,192Marion County, Iowa34,192Oskaloosa, IA μSA21,880Mahaska County, Iowa21,880Cedar Rapids–Iowa City, IA CSA461,996Cedar Rapids, IA MSA279,285Linn County, Iowa232,028Benton County, Iowa26,004Jones County, Iowa21,253Iowa City, IA MSA182,711Johnson County, Iowa160,044Washington County, Iowa22,667Davenport–Moline, IA-IL CSA468,307263,114 ()Davenport–Moline–Rock Island, IA-IL MSA380,452175,259 (IA)Scott County, Iowa175,259Rock Island County, Illinois141,869Henry County, Illinois48,095Mercer County, Illinois15,229Clinton, IA μSA46,002Clinton County, Iowa46,002Muscatine, IA μSA41,853Muscatine County, Iowa41,853noneWaterloo–Cedar Falls, IA MSA169,189Black Hawk County, Iowa131,532Bremer County, Iowa25,296Grundy County, Iowa12,361Sioux City–Le Mars, IA-NE-SD CSA171,435132,346 (IA)Sioux City, IA-NE-SD MSA145,738106,649 (IA)Woodbury County, Iowa106,649Dakota County, Nebraska21,687Union County, South Dakota17,402Le Mars, IA μSA25,697Plymouth County, Iowa25,697Omaha–Fremont, NE-IA CSA1,047,893122,412 (IA)Omaha, NE-IA MSA1,009,836122,412 (IA)Douglas County, Nebraska606,460Sarpy County, Nebraska208,303Pottawattamie County, Iowa92,996Cass County, Nebraska27,657Saunders County, Nebraska23,702Washington County, Nebraska21,302Mills County, Iowa14,793Harrison County, Iowa14,623Fremont, NE μSA38,057Dodge County, Nebraska38,057noneDubuque, IA MSA99,381Dubuque County, Iowa99,381Burlington–Fort Madison, IA-IL CSA76,36770,383 (IA)Burlington, IA-IL μSA44,06138,077 (IA)Des Moines County, Iowa38,077Henderson County, Illinois5,984Fort Madison, IA μSA32,306Lee County, Iowa32,306noneMason City, IA μSA49,710Cerro Gordo County, Iowa42,372Worth County, Iowa7,338Marshalltown, IA μSA39,890Marshall County, Iowa39,890Fort Dodge, IA μSA36,838Webster County, Iowa36,838Ottumwa, IA μSA35,210Wapello County, Iowa35,210Spencer–Spirit Lake, IA CSA34,279Spirit Lake, IA μSA18,077Dickinson County, Iowa18,077Spencer, IA μSA16,202Clay County, Iowa16,202noneStorm Lake, IA μSA20,449Buena Vista County, Iowa20,449Carroll, IA μSA20,303Carroll County, Iowa20,303noneSioux County, Iowa36,774Buchanan County, Iowa20,883Winneshiek County, Iowa19,733Henry County, Iowa19,349Jackson County, Iowa19,288Fayette County, Iowa19,047Poweshiek County, Iowa18,368Cedar County, Iowa18,359Delaware County, Iowa17,674Clayton County, Iowa16,845Tama County, Iowa16,796Iowa County, Iowa16,504Hardin County, Iowa16,455Crawford County, Iowa16,237Jefferson County, Iowa15,291Hamilton County, Iowa14,944Floyd County, Iowa14,901Page County, Iowa14,856Kossuth County, Iowa14,322Allamakee County, Iowa14,238O'Brien County, Iowa14,220Butler County, Iowa14,049Cass County, Iowa12,960Wright County, Iowa12,801Lyon County, Iowa12,354Appanoose County, Iowa12,077Union County, Iowa11,829Shelby County, Iowa11,689Chickasaw County, Iowa11,663Cherokee County, Iowa11,369Mitchell County, Iowa10,650Hancock County, Iowa10,528Louisa County, Iowa10,416Winnebago County, Iowa10,251Montgomery County, Iowa10,002Franklin County, Iowa9,868Keokuk County, Iowa9,797Clarke County, Iowa9,574Calhoun County, Iowa9,562Sac County, Iowa9,525Howard County, Iowa9,415Humboldt County, Iowa9,409Davis County, Iowa9,230Emmet County, Iowa9,107Palo Alto County, Iowa8,899Lucas County, Iowa8,847Greene County, Iowa8,658Monona County, Iowa8,539Decatur County, Iowa7,655Monroe County, Iowa7,406Adair County, Iowa7,403Van Buren County, Iowa7,131Pocahontas County, Iowa6,819Ida County, Iowa6,777Wayne County, Iowa6,738Fremont County, Iowa6,522Osceola County, Iowa5,980Taylor County, Iowa5,835Audubon County, Iowa5,509Ringgold County, Iowa4,642Adams County, Iowa3,617State of Iowa3,238,387

+The 24 core-based statistical areas of the State of Iowa2025 rankCore-based statistical areaPopulation2025 estimateChange2020 CensusChange2010 CensusDes Moines–West Des Moines, IA MSACedar Rapids, IA MSAIowa City, IA MSADavenport–Moline–Rock Island, IA-IL MSA (IA)Waterloo–Cedar Falls, IA MSAAmes, IA MSAOmaha, NE-IA MSA (IA)Sioux City, IA-NE-SD MSA (IA)Dubuque, IA MSAMason City, IA μSAClinton, IA μSAMuscatine, IA μSAMarshalltown, IA μSABurlington, IA-IL μSA (IA)Fort Dodge, IA μSAOttumwa, IA μSAPella, IA μSAFort Madison, IA μSALe Mars, IA μSAOskaloosa, IA μSAStorm Lake, IA μSACarroll, IA μSASpirit Lake, IA μSASpencer, IA μSABurlington, IA-IL μSADavenport–Moline–Rock Island, IA-IL MSAOmaha, NE-IA MSASioux City, IA-NE-SD MSA

+The seven combined statistical areas of the State of Iowa2025 rankCombined statistical areaPopulation2025 estimateChange2020 CensusChange2010 CensusDes Moines–West Des Moines–Ames, IA CSACedar Rapids–Iowa City, IA CSADavenport–Moline, IA-IL CSA (IA)Sioux City–Le Mars, IA-NE-SD CSA (IA)Omaha–Fremont, NE-IA CSA (IA)Burlington–Fort Madison, IA-IL CSA (IA)Spencer–Spirit Lake, IA CSABurlington–Fort Madison, IA-IL CSADavenport–Moline, IA-IL CSAOmaha–Fremont, NE-IA CSASioux City–Le Mars, IA-NE-SD CSA

Iowa statistical areas

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