County · code 39027
Clinton CountyOhio
Clinton County is in southwest Ohio and was formed in 1810. The county seat is Wilmington.
- Founded1810
- County seatWilmington
- Named forGeorge Clinton
- Land area409 sq mi + 3.6 sq mi water
- Population42,018 2020 Census
- Parcels mapped26,806 checked 15 October 2026
Where it is
Clinton on the map of Ohio
Ohio has 88 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1810 from Highland County and Warren County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Clinton County was created in 1810 from Highland and Warren Counties. The county was named after George Clinton. Clinton gained additional territory from Highland and Warren in 1813 and 1815.
- 1810Clinton County created Clinton created from Highland and Warren. · Ohio Laws 1809, 8th assy., ch. 63/p. 236; Chase, 3:ch. 384/pp. 2113-2114
- 1813Gained territory Clinton gained from Highland. · Ohio Laws 1812, 11th assy., ch. 30/p. 67; Chase, 3:ch. 397/pp. 2117-2118
- 1815Gained territory Clinton gained from Highland and Warren. · Ohio Laws 1814, 13th assy., ch. 31, secs. 1, 2, 4, 5/pp. 109-112; Chase, 3:ch. 400/pp. 2119-2120
Land and parcels
What the maps cover in Clinton
Who publishes each layer, how good it is, and when we last checked.
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Parcels Fallback
Lot lines and tax-map numbers for 26,806 parcels from Clinton County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey. This copy is a fallback, not the county's own: use it as a guide and check the official record.
edited 21 September 2020 · checked 15 October 2026 -
Address points Official
One point per address, 20,161 in all from Ohio Geographically Referenced Information Program (OGRIP), Ohio DAS/OIT (state GIS office).
edited 24 June 2025 · checked 13 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- 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
Clinton by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Clinton County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Clinton County.
See your own lot on these maps
Open Clinton 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.
Questions
Common questions about Clinton County
- When was Clinton County founded?
- Clinton County was founded in 1810, formed from Highland County and Warren County, and named after George Clinton.
- What is the county seat of Clinton County?
- The county seat of Clinton County is Wilmington.
- Is there an online parcel map for Clinton County?
- Yes. Clinton County publishes a parcel map of 26,806 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Clinton County's boundary or name changed?
- Clinton County was created in 1810 from Highland County and Warren County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Highland County and Warren County.
- Is my lot in a flood zone?
- We do not have flood maps for Clinton County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby