County Maps US

Defiance County, Ohio

A county in Ohio, ranked 65 of 88 by population.

CountyFIPS 39039

Within Ohio
Defiance County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Defiance, the county seat, located via the 2025 Census Gazetteer.

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Population
38,292
+24 (+0.1%) since 2020
Land area
411.4
square miles. A further 0.7% of the total area is water
Population density
93.1
people per square mile, computed rather than published
County seat
Defiance
Seat of county government.
Established
1845
180 years ago
Largest city
Defiance city
Population 17,009.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Defiance County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Defiance County, Ohio from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 518 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Defiance County ranks

Position among the 88 counties of Ohio, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn OhioNationally
Population38,29265th of 881,226th of 3,144
Land area411.4 sq mi62nd of 882,459th of 3,144
Population density93.1 per sq mi58th of 88965th of 3,144
Median household income$73,06431st of 88967th of 3,143

Full data for Defiance County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population38,292Vintage 2025 Population Estimates
Population in 202038,268Vintage 2025 Population Estimates
2020 estimates base?38,288Vintage 2025 Population Estimates
Land area411.4 sq mi2025 Gazetteer Files
Water area2.7 sq mi2025 Gazetteer Files
Total area414.2 sq mi2025 Gazetteer Files
Population density?93.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$73,064American Community Survey 2020-2024 5-Year Estimates
Median home value$163,200American Community Survey 2020-2024 5-Year Estimates
Median age41.1American Community Survey 2020-2024 5-Year Estimates
Households15,327American Community Survey 2020-2024 5-Year Estimates
Housing units16,565American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-20
429 births, 449 deaths
Net migration
-22
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Defiance County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Paulding CountyOhio30 mi18,727
Williams CountyOhio24 mi36,549
Henry CountyOhio24 mi27,598
DeKalb CountyIndiana11 mi44,535
Putnam CountyOhio5.9 mi34,380
Allen CountyIndiana1.3 mi402,329

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 88 counties of Ohio

Open the interactive Ohio county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.