Iowa
Postal abbreviation IA. 1,055 ZIP codes across 99 counties.
| Population | 3,210,507 |
|---|---|
| Postal abbreviation | IA |
| ZIP codes | 1,055 ZIP codes → |
| Area codes | 319515563641712 |
| Time zone | Central |
| Counties | 99 |
Largest cities by population
Des Moines · 212,421Cedar Rapids · 137,264Davenport · 100,913Sioux City · 86,101Iowa City · 75,752Ankeny · 72,615West Des Moines · 71,083Ames · 67,669Waterloo · 67,008Council Bluffs · 62,586Dubuque · 59,174Urbandale · 46,595Marion · 41,896Cedar Falls · 40,888Bettendorf · 39,647Waukee · 29,236Marshalltown · 27,626Mason City · 27,050Ottumwa · 25,430Fort Dodge · 24,827Johnston · 24,384Clinton · 24,322Burlington · 23,728Muscatine · 23,489Coralville · 23,234Altoona · 21,495North Liberty · 21,125Clive · 19,012Grimes · 16,366Indianola · 16,044
Largest counties by population
Polk County · 503,175Linn County · 230,004Scott County · 174,608Johnson County · 156,639Black Hawk County · 131,049Dallas County · 107,968Woodbury County · 106,247Story County · 100,466Dubuque County · 99,030Pottawattamie County · 93,424
Counties in Iowa
Adair CountyAdams CountyAllamakee CountyAppanoose CountyAudubon CountyBenton CountyBlack Hawk CountyBoone CountyBremer CountyBuchanan CountyBuena Vista CountyButler CountyCalhoun CountyCarroll CountyCass CountyCedar CountyCerro Gordo CountyCherokee CountyChickasaw CountyClarke CountyClay CountyClayton CountyClinton CountyCrawford CountyDallas CountyDavis CountyDecatur CountyDelaware CountyDes Moines CountyDickinson CountyDubuque CountyEmmet CountyFayette CountyFloyd CountyFranklin CountyFremont CountyGreene CountyGrundy CountyGuthrie CountyHamilton CountyHancock CountyHardin CountyHarrison CountyHenry CountyHoward CountyHumboldt CountyIda CountyIowa CountyJackson CountyJasper CountyJefferson CountyJohnson CountyJones CountyKeokuk CountyKossuth CountyLee CountyLinn CountyLouisa CountyLucas CountyLyon CountyMadison CountyMahaska CountyMarion CountyMarshall CountyMills CountyMitchell CountyMonona CountyMonroe CountyMontgomery CountyMuscatine CountyO'Brien CountyOsceola CountyPage CountyPalo Alto CountyPlymouth CountyPocahontas CountyPolk CountyPottawattamie CountyPoweshiek CountyRinggold CountySac CountyScott CountyShelby CountySioux CountyStory CountyTama CountyTaylor CountyUnion CountyVan Buren CountyWapello CountyWarren CountyWashington CountyWayne CountyWebster CountyWinnebago CountyWinneshiek CountyWoodbury CountyWorth CountyWright County
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.