County Maps US

Williams County, Ohio

A county in Ohio, ranked 67 of 88 by population.

CountyFIPS 39171

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

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Population
36,549
-535 (-1.4%) since 2020
Land area
420.7
square miles. A further 0.6% of the total area is water
Population density
86.9
people per square mile, computed rather than published
County seat
Bryan
Seat of county government.
Established
1820
205 years ago
Largest city
Bryan city
Population 8,579.

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 Williams 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 Williams 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 661 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 Williams 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
Population36,54967th of 881,285th of 3,144
Land area420.7 sq mi53rd of 882,409th of 3,144
Population density86.9 per sq mi65th of 881,018th of 3,144
Median household income$61,04863rd of 881,986th of 3,143

Full data for Williams County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population36,549Vintage 2025 Population Estimates
Population in 202037,084Vintage 2025 Population Estimates
2020 estimates base?37,106Vintage 2025 Population Estimates
Land area420.7 sq mi2025 Gazetteer Files
Water area2.4 sq mi2025 Gazetteer Files
Total area423.1 sq mi2025 Gazetteer Files
Population density?86.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,048American Community Survey 2020-2024 5-Year Estimates
Median home value$150,000American Community Survey 2020-2024 5-Year Estimates
Median age41.6American Community Survey 2020-2024 5-Year Estimates
Households15,476American Community Survey 2020-2024 5-Year Estimates
Housing units16,564American 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
-24
419 births, 443 deaths
Net migration
-49
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 Williams 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
Defiance CountyOhio24 mi38,292
Hillsdale CountyMichigan21 mi45,738
Fulton CountyOhio18 mi41,853
Steuben CountyIndiana11 mi34,799
DeKalb CountyIndiana7.2 mi44,535
Henry CountyOhio4.0 mi27,598

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.