County Maps US

Preble County, Ohio

A county in Ohio, ranked 61 of 88 by population.

CountyFIPS 39135

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

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Population
40,664
-343 (-0.8%) since 2020
Land area
424.2
square miles. A further 0.5% of the total area is water
Population density
95.9
people per square mile, computed rather than published
County seat
Eaton
Seat of county government.
Established
1808
217 years ago
Largest city
Eaton city
Population 8,327.

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 Preble 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 Preble 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 611 by 800 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 Preble 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
Population40,66461st of 881,179th of 3,144
Land area424.2 sq mi48th of 882,387th of 3,144
Population density95.9 per sq mi57th of 88944th of 3,144
Median household income$69,22341st of 881,258th of 3,143

Full data for Preble County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population40,664Vintage 2025 Population Estimates
Population in 202041,007Vintage 2025 Population Estimates
2020 estimates base?40,999Vintage 2025 Population Estimates
Land area424.2 sq mi2025 Gazetteer Files
Water area2.3 sq mi2025 Gazetteer Files
Total area426.6 sq mi2025 Gazetteer Files
Population density?95.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$69,223American Community Survey 2020-2024 5-Year Estimates
Median home value$180,900American Community Survey 2020-2024 5-Year Estimates
Median age43.3American Community Survey 2020-2024 5-Year Estimates
Households16,725American Community Survey 2020-2024 5-Year Estimates
Housing units18,140American 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
-133
381 births, 514 deaths
Net migration
+77
More people moved in than moved out.

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

The 5 areas bordering Preble 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
Montgomery CountyOhio23 mi539,598
Butler CountyOhio19 mi400,128
Darke CountyOhio17 mi51,520
Wayne CountyIndiana13 mi66,169
Union CountyIndiana11 mi6,863

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.