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County · code 19175

Union CountyIowa

Union County is a county in Iowa with its seat in Creston, formed in 1851.

  • Founded1851
  • County seatCreston
  • Named forUnited States
  • Land area424 sq mi + 2.2 sq mi water
  • Population12,138 2020 Census
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Updated

RinggoldAdams Creston Census outline · seat marked

Where it is

Union on the map of Iowa

Iowa has 99 counties and county equivalents, each with its own records office. Shapes with a page are links.

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 CountyVan Buren CountyWapello CountyWarren CountyWashington CountyWayne CountyWebster CountyWinnebago CountyWinneshiek CountyWoodbury CountyWorth CountyWright CountyUnion County Union
Counties of Iowa · Union highlighted

History

Formed in 1851 from Pottawattamie County and Monroe County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Union County was created on January 15, 1851, from Pottawattamie County and a non-county area attached to Monroe County, though it was not fully organized at that time. The county was fully organized on March 1, 1853, and was named after the United States.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1851
    Union County created Union created from Pottawattamie and Non-County Area 4 attached to Monroe; Union not fully organized, not attached.
    from Pottawattamiefrom Monroe
    · Iowa Acts 1850-1851, ch. 9, sec. 1/p. 27
  2. 1853
    Changed Union fully organized. · Iowa Acts 1852-1853, ch. 11, sec. 1/pp. 26-27

Land and parcels

What the maps cover in Union

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Union by the Census

Population
12,138 2020 Census count
Housing units
5,784 2020 Census count
Land area
424 square miles
Water area
2.2 square miles
People per sq mi
29 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Union County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Union County

When was Union County founded?
Union County was founded in 1851, formed from Pottawattamie County and Monroe County, and named after United States.
What is the county seat of Union County?
The county seat of Union County is Creston.
Is there an online parcel map for Union County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Union County's boundary or name changed?
Union County was created in 1851 from Pottawattamie County and Monroe County. Since then the Atlas of Historical County Boundaries records 1 later change.
Is my lot in a flood zone?
We do not have flood maps for Union County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door