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County · code 19083

Hardin CountyIowa

Hardin County is in Iowa and has its seat in Eldora. It was created in 1851 and named after John J. Hardin.

  • Founded1851
  • County seatEldora
  • Named forJohn J. Hardin
  • Land area569 sq mi + 0.7 sq mi water
  • Population16,878 2020 Census
  • Parcels mapped21,881 checked 15 October 2026
Open the free map Click any parcel in Hardin County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

GrundyHamilton Eldora Census outline · seat marked

Where it is

Hardin 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 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 CountyHardin County Hardin
Counties of Iowa · Hardin highlighted

History

Formed in 1851 from Delaware County and Polk County

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

Hardin County was created on January 15, 1851 from parts of Delaware and Polk counties but was not initially organized or attached to any county. It was briefly attached to Marshall County in 1853 for administrative purposes, then fully organized and detached later that year. Franklin County was attached to Hardin in 1855 for election and judicial purposes, but was fully organized and detached in 1856.

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

  1. 1851
    Hardin County created Hardin created from Non-County Area 6 attached to Delaware and Non-County Area 9 attached to Polk; Hardin not fully organized, not attached.
    from Delawarefrom Polk
    · Iowa Acts 1850-1851, ch. 9, sec. 11/pp. 29-30
  2. 1853
    Changed Hardin attached to Marshall for administrative and judicial purposes.
    Marshall
    · (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28
  3. 1853
    Changed Hardin fully organized, detached from Marshall.
    Marshall
    · Swisher, "Organization of Counties," 575
  4. 1855
    Changed Franklin detached from Chickasaw, attached to Hardin "for election, judicial, and revenue purposes."
    FranklinChickasaw
    · Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211
  5. 1856
    Changed Franklin fully organized, detached from Hardin.
    Franklin
    · Swisher, "Organization of Counties," 575

Land and parcels

What the maps cover in Hardin

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

Hardin by the Census

Population
16,878 2020 Census count
Housing units
8,032 2020 Census count
Land area
569 square miles
Water area
0.7 square miles
People per sq mi
30 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

Hardin 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

Open Hardin County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Hardin County

When was Hardin County founded?
Hardin County was founded in 1851, formed from Delaware County and Polk County, and named after John J. Hardin.
What is the county seat of Hardin County?
The county seat of Hardin County is Eldora.
Is there an online parcel map for Hardin County?
Yes. Hardin County publishes a parcel map of 21,881 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Hardin County's boundary or name changed?
Hardin County was created in 1851 from Delaware County and Polk County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Franklin County, Marshall County and Chickasaw County.
Is my lot in a flood zone?
We do not have flood maps for Hardin 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