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County · code 39065

Hardin CountyOhio

Hardin County is a county in Ohio with its seat in Kenton, formed in 1820.

  • Founded1820
  • County seatKenton
  • Named forJohn Hardin
  • Land area470 sq mi + 0.2 sq mi water
  • Population30,696 2020 Census
  • Parcels mapped25,981 checked 14 October 2026
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Updated

LoganHancockWyandotMarionAuglaize Kenton Census outline · seat marked

Where it is

Hardin on the map of Ohio

Ohio has 88 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Ohio · Hardin highlighted

History

Formed in 1820 from Delaware County and Logan County

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

Hardin County was created in 1820 from parts of Delaware and Logan counties, but was not fully organized and remained attached to Logan for administrative and judicial purposes. The county was fully organized and detached from Logan in 1833. In 1845, Hardin County lost territory to the creation of Wyandot County.

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

  1. 1820
    Hardin County created Hardin created from Non-County Area 5 attached to Delaware and Non-County Area 9 attached to Logan; Hardin not fully organized, attached to Logan for administrative and judicial purposes.
    from Delawarefrom Logan
    · Ohio Laws 1819, 18th assy., loc., ch. 37, secs. 1-2/pp. 90-91; Chase, 3:ch. 429/pp. 2134-2135
  2. 1833
    Changed Hardin fully organized, detached from Logan.
    Logan
    · Ohio Laws 1832, 31st assy., gen., p. 10; Chase, 3:ch. 479/p. 2147
  3. 1845
    Lost territory Hardin lost to creation of Wyandot.
    to Wyandot
    · Ohio Laws 1844, 43d assy., loc., secs. 1-2, 4/pp. 61-62
  4. 1883
    Boundary clarified Boundary between Hardin and Logan was clarified (no change).
    with Loganno change
    · Ohio Laws 1883, 65th assy., adj. sess., p. 341

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
30,696 2020 Census count
Housing units
12,883 2020 Census count
Land area
470 square miles
Water area
0.2 square miles
People per sq mi
65 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 1820, formed from Delaware County and Logan County, and named after John Hardin.
What is the county seat of Hardin County?
The county seat of Hardin County is Kenton.
Is there an online parcel map for Hardin County?
Yes. Ohio Geographically Referenced Information Program (OGRIP, Ohio DAS) statewide compilation of county auditor parcels publishes a parcel map of 25,981 parcels, rated fallback 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 1820 from Delaware County and Logan County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Logan County and Wyandot 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