County · code 39039
Defiance CountyOhio
Defiance County is a county in Ohio, with its seat in the city of Defiance. The county was created on April 7, 1845, from parts of Henry, Paulding, and Williams counties.
- Founded1845
- County seatDefiance
- Named forFort Defiance, Ohio
- Land area411 sq mi + 2.7 sq mi water
- Population38,286 2020 Census
- Parcels mapped26,864 checked 14 October 2026
Where it is
Defiance 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 1845 from Henry County, Paulding County and Williams County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Defiance County was created in 1845 from Henry, Paulding, and Williams counties. The county was named after Fort Defiance.
- 1845Defiance County created Defiance created from Henry, Paulding, and Williams. · Ohio Laws 1844, 43d assy., loc., sec. 1/p. 191
Land and parcels
What the maps cover in Defiance
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 26,864 parcels from Ohio Geographically Referenced Information Program (OGRIP, Ohio DAS) statewide compilation of county auditor parcels. 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 23 September 2026 · checked 14 October 2026 -
Address points Official
One point per address, 18,700 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
Defiance 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
Defiance 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 Defiance County.
See your own lot on these maps
Open Defiance 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 Defiance County
- When was Defiance County founded?
- Defiance County was founded in 1845, formed from Henry County, Paulding County and Williams County, and named after Fort Defiance, Ohio.
- What is the county seat of Defiance County?
- The county seat of Defiance County is Defiance.
- Is there an online parcel map for Defiance County?
- Yes. Ohio Geographically Referenced Information Program (OGRIP, Ohio DAS) statewide compilation of county auditor parcels publishes a parcel map of 26,864 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Defiance County's boundary or name changed?
- Defiance County was created in 1845 from Henry County, Paulding County and Williams County. The Atlas of Historical County Boundaries records no boundary change since.
- Is my lot in a flood zone?
- We do not have flood maps for Defiance County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby