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Population of Counties in Ohio (2024)

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2024 Population
Growth Since 2020
Area (mi²)
Density (/mi²)
Franklin County1,330,3960.45%2052,501Franklin County location
Cuyahoga County1,229,182-2.64%1762,690Cuyahoga County location
Hamilton County829,395-0.12%1562,048Hamilton County location
Summit County535,697-0.76%1591,297Summit County location
Montgomery County534,118-0.56%1781,159Montgomery County location
Lucas County424,249-1.53%1311,248Lucas County location
Butler County396,3581.4%180849Butler County location
Stark County372,647-0.5%222648Stark County location
Lorain County319,7892.01%190651Lorain County location
Warren County254,5614.66%155635Warren County location
Delaware County236,74610.03%171534Delaware County location
Lake County231,544-0.42%881,011Lake County location
Mahoning County225,270-1.2%159548Mahoning County location
Clermont County213,2652.16%175471Clermont County location
Trumbull County200,020-0.82%239324Trumbull County location
Licking County184,6373.27%263271Licking County location
Medina County184,5951.07%163438Medina County location
Greene County170,3551.32%160411Greene County location
Fairfield County167,7645.22%195333Fairfield County location
Portage County163,5881.07%188336Portage County location
Clark County134,488-1.03%153340Clark County location
Wood County133,6581.06%238217Wood County location
Richland County124,867-0.08%191252Richland County location
Wayne County116,468-0.39%214210Wayne County location
Miami County111,5392.37%157274Miami County location
Allen County100,579-1.51%156250Allen County location
Columbiana County99,795-1.82%205188Columbiana County location
Ashtabula County96,730-0.78%271138Ashtabula County location
Geauga County95,323-0.07%154238Geauga County location
Tuscarawas County91,777-1.52%219162Tuscarawas County location
Muskingum County86,4960.03%257130Muskingum County location
Ross County76,494-0.72%266111Ross County location
Hancock County74,634-0.39%205141Hancock County location
Erie County73,556-2.55%97293Erie County location
Union County72,39814.76%167168Union County location
Scioto County71,749-2.84%235118Scioto County location
Marion County65,093-0.45%156161Marion County location
Athens County64,5313.43%195128Athens County location
Belmont County64,341-2.94%205121Belmont County location
Jefferson County63,779-2.15%157156Jefferson County location
Knox County63,4441.02%203121Knox County location
Pickaway County62,1655.98%193124Pickaway County location
Sandusky County58,851-0.01%157144Sandusky County location
Washington County58,286-2.28%24492Washington County location
Huron County58,179-0.54%190118Huron County location
Lawrence County55,664-4.25%175123Lawrence County location
Seneca County54,520-0.97%21399Seneca County location
Ashland County52,356-0.22%163124Ashland County location
Darke County51,304-1.14%23186Darke County location
Shelby County47,846-0.62%157117Shelby County location
Auglaize County46,154-0.68%155115Auglaize County location
Logan County46,052-0.14%177100Logan County location
Madison County45,6234.05%18098Madison County location
Holmes County44,3970.38%163105Holmes County location
Brown County43,8540.41%18989Brown County location
Highland County43,8021.02%21379Highland County location
Mercer County42,454-0.21%17892Mercer County location
Clinton County41,986-0.1%158103Clinton County location
Fulton County41,856-1.85%156103Fulton County location
Crawford County41,549-1.1%155103Crawford County location
Preble County40,538-1.14%16496Preble County location
Ottawa County39,638-1.63%98155Ottawa County location
Champaign County38,9470.53%16691Champaign County location
Defiance County38,5020.63%15994Defiance County location
Guernsey County38,118-0.79%20173Guernsey County location
Coshocton County37,1231.47%21866Coshocton County location
Williams County36,534-1.47%16387Williams County location
Morrow County35,8542.5%15788Morrow County location
Perry County35,6310.52%15787Perry County location
Putnam County34,068-0.92%18671Putnam County location
Jackson County32,601-0.19%16278Jackson County location
Hardin County30,345-1.24%18165Hardin County location
Gallia County28,942-1%18062Gallia County location
Fayette County28,802-0.6%15771Fayette County location
Van Wert County28,604-1.08%15870Van Wert County location
Adams County27,5830.52%22547Adams County location
Henry County27,514-0.56%16166Henry County location
Hocking County27,262-2.77%16365Hocking County location
Pike County26,990-0.3%17061Pike County location
Carroll County26,8300.48%15268Carroll County location
Meigs County21,573-2.64%16650Meigs County location
Wyandot County21,362-2.3%15752Wyandot County location
Paulding County18,650-0.86%16145Paulding County location
Noble County14,2971.47%15436Noble County location
Harrison County13,967-3.62%15535Harrison County location
Morgan County13,623-1.01%16133Morgan County location
Monroe County13,091-1.94%17629Monroe County location
Vinton County12,371-3.36%15930Vinton County location
showing: 88 rows

There are 88 counties in Ohio. In 2019, Ohio's Franklin County, home of Columbus, has the highest population in the state with 1,310,300 residents. This represents growth of 12.35% since the last census. The next-largest counties are Cuyahoga County (1,243,857) with the city of Cleveland, Hamilton County (816,684) with the city of Cincinnati, Summit County (541,918), and Montgomery County (532,331). These are the only counties in Ohio exceeding 500,000 residents. Of these counties, Franklin County experienced the most rapid growth while Cuyahoga County experienced growth of -2.68%.

Ohio Counties with Fewest Residents

There are no counties in Ohio with fewer than 10,000 residents. The least populated county in Ohio is Vinton County with 13,139, a decline of 1.98%. Other small counties in Ohio include Monroe County (13,790), Noble County (14,354), Morgan County (14,604), Harrison County (15,174), and Paulding County (18,760). All of these counties have experienced a decline in population. Monroe County had the largest decline of 5.60%. Of Ohio's 39 counties with a population below 50,000, all but five experienced a decline in population ranging from -0.02% to -6.12% in the case of Carroll County.

Ohio Counties with Rapid Growth

Delaware County, Ohio experienced the most rapid growth in the state since the last census, climbing 16.98% to 204,826 residents in 2019. Other cities with major growth include Franklin County (12.35%), Union County (10.35%), Warren County (8.77%), and Fairfield County (6.41%). The county with the most rapid decline is Carroll County at -6.12% population growth followed by Jefferson County (-5.60%), Monroe County (-5.60%), and Trumbull County (-5.34%).

Lists of Counties in all States

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)