County Maps US

Franklin County, Ohio

The most populous of Ohio's 88 counties.

CountyFIPS 39049

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

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Population
1,361,536
+37,058 (+2.8%) since 2020
Land area
532.4
square miles. A further 2.1% of the total area is water
Population density
2,557
people per square mile, computed rather than published
County seat
Columbus
Seat of county government.
Established
1803
222 years ago
Largest city
Columbus city
Population 911,199 for the whole place, which extends beyond this county.

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 Franklin 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 Franklin 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 736 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 Franklin 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
Population1,361,5361st of 8832nd of 3,144
Land area532.4 sq mi17th of 881,960th of 3,144
Population density2,557 per sq mi2nd of 8850th of 3,144
Median household income$75,17623rd of 88830th of 3,143

Full data for Franklin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population1,361,536Vintage 2025 Population Estimates
Population in 20201,324,478Vintage 2025 Population Estimates
2020 estimates base?1,323,793Vintage 2025 Population Estimates
Land area532.4 sq mi2025 Gazetteer Files
Water area11.2 sq mi2025 Gazetteer Files
Total area543.6 sq mi2025 Gazetteer Files
Population density?2,557 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$75,176American Community Survey 2020-2024 5-Year Estimates
Median home value$288,400American Community Survey 2020-2024 5-Year Estimates
Median age34.8American Community Survey 2020-2024 5-Year Estimates
Households553,099American Community Survey 2020-2024 5-Year Estimates
Housing units595,469American 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
+6,591
17,144 births, 10,553 deaths
Net migration
+2,250
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 6 areas bordering Franklin 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
Madison CountyOhio26 mi46,985
Pickaway CountyOhio22 mi62,978
Delaware CountyOhio22 mi242,032
Fairfield CountyOhio14 mi169,752
Licking CountyOhio13 mi185,564
Union CountyOhio4.4 mi73,446

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.