County Maps US

Ohio County Map

Ohio has 88 counties. Together they cover 40,859 sq mi of land and 11,900,510 people.

Neighbouring areas are given different colours so their shared borders read clearly. These colours carry no data.

Boundaries from the 2025 Census cartographic boundary file, generalised so that no point moves by more than half a pixel at this width. Select any area to open its page.
Counties
88
13th most of the 51 states and DC
Population
11,900,510
7th largest
Land area
40,859
square miles
Density
291.3
people per square mile, computed

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. Retrieved 30 August 2026.

Download this map

Free to use and redistribute. The boundaries are public-domain Census Bureau data; attribution to County Maps US is appreciated but not required.

Satellite view

Aerial imagery of Ohio with the state boundary drawn on top. County lines are not drawn here: at this scale they would bury the picture, and the map above already carries them.

Aerial view of 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 742 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.

The extremes of Ohio

Most populous

Franklin County

1,361,536

Least populous

Vinton County

12,645

Largest by land area

Ashtabula County

702.4 sq mi

Smallest by land area

Lake County

229.4 sq mi

Most densely populated

Cuyahoga County

2,696 per sq mi

Highest median household income

Delaware County

$133,540

Which is the largest county in Ohio? The answer depends on whether you mean area or population.

The counties, by shape

Every one, drawn to its own scale so the small ones stay recognisable. Shape alone is not a size comparison; the table below carries the areas.

What the map does not say

The counties of Ohio are nowhere near the same size. Ashtabula County covers 702.4 sq mi of land, 3.1 times the 229.4 sq mi of Lake County. People are spread even less evenly: Cuyahoga County packs 2,696 per sq mi while Monroe County holds 28.5 per sq mi.

They were not drawn in one sitting either. Washington County dates to 1788, and the boundaries were still being redrawn when Noble County was organised in 1851, 63 years later. Founding years come from Wikidata and are worth checking against the county's own history before citing.

Water is part of the picture too: 76.6% of Lake County is water, the most in the state, which is why its land area and total area disagree. And 60 of the 88 counties here share their names with counties in other states, so searching by name alone can land in the wrong place; the A to Z index lists every duplicate.

All 88 counties of Ohio

Sortable on any column. This table doubles as the text alternative to the map above: every area is a link, in alphabetical order, whether or not the map renders.

The 88 counties of Ohio, with population, land area, density, median household income, county seat and FIPS code.
NamePopulationLand areaDensityMedian incomeSeatFIPS
Adams County27,865583.9 sq mi47.7 per sq mi$50,264West Union39001
Allen County100,881402.5 sq mi251 per sq mi$64,038Lima39003
Ashland County52,523423 sq mi124 per sq mi$69,860Ashland39005
Ashtabula County96,713702.4 sq mi138 per sq mi$57,728Jefferson39007
Athens County63,197503.6 sq mi125 per sq mi$56,001Athens39009
Auglaize County45,909401.4 sq mi114 per sq mi$78,660Wapakoneta39011
Belmont County64,434532.2 sq mi121 per sq mi$57,017St. Clairsville39013
Brown County44,397489.6 sq mi90.7 per sq mi$71,270Georgetown39015
Butler County400,128466.5 sq mi858 per sq mi$81,590Hamilton39017
Carroll County26,475394.7 sq mi67.1 per sq mi$64,835Carrollton39019
Champaign County38,820429 sq mi90.5 per sq mi$75,556Urbana39021
Clark County135,340395.9 sq mi342 per sq mi$63,132Springfield39023
Clermont County216,977452.6 sq mi479 per sq mi$85,510Batavia39025
Clinton County42,301408.7 sq mi103 per sq mi$70,407Wilmington39027
Columbiana County99,377531.9 sq mi187 per sq mi$58,180Lisbon39029
Coshocton County37,188563.9 sq mi65.9 per sq mi$55,577Coshocton39031
Crawford County41,896401.8 sq mi104 per sq mi$58,044Bucyrus39033
Cuyahoga County1,232,925457.2 sq mi2,696 per sq mi$64,468Cleveland39035
Darke County51,520598.1 sq mi86.1 per sq mi$64,486Greenville39037
Defiance County38,292411.4 sq mi93.1 per sq mi$73,064Defiance39039
Delaware County242,032443.1 sq mi546 per sq mi$133,540Delaware39041
Erie County73,296251.3 sq mi292 per sq mi$71,993Sandusky39043
Fairfield County169,752504.4 sq mi337 per sq mi$90,966Lancaster39045
Fayette County28,552406.4 sq mi70.3 per sq mi$63,275Washington Court House39047
Franklin County1,361,536532.4 sq mi2,557 per sq mi$75,176Columbus39049
Fulton County41,853405.5 sq mi103 per sq mi$72,864Wauseon39051
Gallia County29,072466.5 sq mi62.3 per sq mi$56,830Gallipolis39053
Geauga County95,676400.4 sq mi239 per sq mi$107,860Chardon39055
Greene County174,322413.6 sq mi421 per sq mi$87,309Xenia39057
Guernsey County38,379522.2 sq mi73.5 per sq mi$58,478Cambridge39059
Hamilton County838,418405.5 sq mi2,068 per sq mi$72,470Cincinnati39061
Hancock County75,034531.3 sq mi141 per sq mi$73,141Findlay39063
Hardin County30,072470.3 sq mi63.9 per sq mi$62,484Kenton39065
Harrison County14,070402.3 sq mi35.0 per sq mi$54,414Cadiz39067
Henry County27,598416 sq mi66.3 per sq mi$80,099Napoleon39069
Highland County43,823553.1 sq mi79.2 per sq mi$65,785Hillsboro39071
Hocking County27,512421.3 sq mi65.3 per sq mi$62,960Logan39073
Holmes County44,970422.6 sq mi106 per sq mi$76,140Millersburg39075
Huron County58,250492.2 sq mi118 per sq mi$67,878Norwalk39077
Jackson County32,817420.3 sq mi78.1 per sq mi$57,106Jackson39079
Jefferson County63,597408.1 sq mi156 per sq mi$59,055Steubenville39081
Knox County64,002525.5 sq mi122 per sq mi$73,878Mount Vernon39083
Lake County232,217229.4 sq mi1,012 per sq mi$80,925Painesville39085
Lawrence County55,710453.4 sq mi123 per sq mi$58,325Ironton39087
Licking County185,564682.4 sq mi272 per sq mi$84,426Newark39089
Logan County46,302458.5 sq mi101 per sq mi$71,551Bellefontaine39091
Lorain County323,219490.5 sq mi659 per sq mi$73,347Elyria39093
Lucas County423,347339.7 sq mi1,246 per sq mi$62,224Toledo39095
Madison County46,985466.7 sq mi101 per sq mi$87,045London39097
Mahoning County224,706411.5 sq mi546 per sq mi$56,942Youngstown39099
Marion County65,115403.8 sq mi161 per sq mi$59,371Marion39101
Medina County185,025421.5 sq mi439 per sq mi$94,968Medina39103
Meigs County21,587430.1 sq mi50.2 per sq mi$46,873Pomeroy39105
Mercer County42,737462.4 sq mi92.4 per sq mi$76,782Celina39107
Miami County112,634406.6 sq mi277 per sq mi$76,817Troy39109
Monroe County12,994455.6 sq mi28.5 per sq mi$60,134Woodsfield39111
Montgomery County539,598461.4 sq mi1,170 per sq mi$66,139Dayton39113
Morgan County13,626416.4 sq mi32.7 per sq mi$59,351McConnelsville39115
Morrow County36,305406.1 sq mi89.4 per sq mi$75,283Mount Gilead39117
Muskingum County87,014664.5 sq mi131 per sq mi$60,780Zanesville39119
Noble County14,276398 sq mi35.9 per sq mi$56,098Caldwell39121
Ottawa County39,481254.7 sq mi155 per sq mi$76,101Port Clinton39123
Paulding County18,727416.4 sq mi45.0 per sq mi$67,731Paulding39125
Perry County35,918407.9 sq mi88.0 per sq mi$67,460New Lexington39127
Pickaway County62,978501.3 sq mi126 per sq mi$74,040Circleville39129
Pike County27,061440.3 sq mi61.5 per sq mi$52,736Waverly39131
Portage County163,404487.5 sq mi335 per sq mi$75,766Ravenna39133
Preble County40,664424.2 sq mi95.9 per sq mi$69,223Eaton39135
Putnam County34,380482.5 sq mi71.2 per sq mi$84,928Ottawa39137
Richland County124,893495.2 sq mi252 per sq mi$59,509Mansfield39139
Ross County76,429689.2 sq mi111 per sq mi$61,303Chillicothe39141
Sandusky County58,655408.2 sq mi144 per sq mi$62,295Fremont39143
Scioto County71,365610.2 sq mi117 per sq mi$50,609Portsmouth39145
Seneca County54,522551 sq mi98.9 per sq mi$66,025Tiffin39147
Shelby County48,065407.7 sq mi118 per sq mi$73,978Sidney39149
Stark County373,771574.9 sq mi650 per sq mi$67,934Canton39151
Summit County538,376412.7 sq mi1,305 per sq mi$71,622Akron39153
Trumbull County198,972617.6 sq mi322 per sq mi$56,435Warren39155
Tuscarawas County92,373567.6 sq mi163 per sq mi$65,044New Philadelphia39157
Union County73,446431.7 sq mi170 per sq mi$112,322Marysville39159
Van Wert County29,013409.2 sq mi70.9 per sq mi$67,917Van Wert39161
Vinton County12,645412.4 sq mi30.7 per sq mi$55,336McArthur39163
Warren County257,181401.4 sq mi641 per sq mi$110,132Lebanon39165
Washington County58,389632.2 sq mi92.4 per sq mi$63,603Marietta39167
Wayne County116,758555 sq mi210 per sq mi$73,574Wooster39169
Williams County36,549420.7 sq mi86.9 per sq mi$61,048Bryan39171
Wood County134,176617.2 sq mi217 per sq mi$74,216Bowling Green39173
Wyandot County21,567406.9 sq mi53.0 per sq mi$69,768Upper Sandusky39175

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; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Looking for Ohio County?

Ohio is also the name of 3 counties in other states. If you meant one of those rather than the state of Ohio, they are listed here.

The ten most populous

  1. Franklin County1,361,536
  2. Cuyahoga County1,232,925
  3. Hamilton County838,418
  4. Montgomery County539,598
  5. Summit County538,376
  6. Lucas County423,347
  7. Butler County400,128
  8. Stark County373,771
  9. Lorain County323,219
  10. Warren County257,181

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