Population of Counties in Ohio (2018)

Name 2018 Population Growth Since 2010
Franklin County1,291,98110.78%
Cuyahoga County1,248,514-2.32%
Hamilton County813,8221.44%
Summit County541,228-0.08%
Montgomery County531,542-0.75%
Lucas County430,887-2.39%
Butler County380,6043.12%
Stark County372,542-0.75%
Lorain County307,9242.14%
Lake County230,1170.05%
Mahoning County229,796-3.61%
Warren County228,8827.22%
Clermont County204,2143.35%
Delaware County200,46414.47%
Trumbull County200,380-4.50%
Medina County178,3713.40%
Licking County173,4484.04%
Greene County166,7523.19%
Portage County162,2770.55%
Fairfield County154,7335.69%
Clark County134,557-2.68%
Wood County130,4923.61%
Richland County120,589-2.88%
Wayne County116,0381.44%
Miami County105,1222.58%
Allen County103,198-2.98%
Columbiana County103,077-4.45%
Ashtabula County97,807-3.54%
Geauga County93,9180.56%
Tuscarawas County92,297-0.27%
Muskingum County86,149-0.08%
Ross County77,313-0.99%
Scioto County75,929-4.49%
Hancock County75,7541.43%
Erie County74,817-2.81%
Belmont County68,029-3.29%
Athens County66,5972.18%
Jefferson County66,359-4.74%
Marion County64,967-2.24%
Knox County61,2610.28%
Washington County60,418-2.09%
Lawrence County60,249-3.48%
Sandusky County59,195-2.77%
Huron County58,494-1.78%
Pickaway County57,8303.76%
Union County56,7418.31%
Seneca County55,243-2.43%
Ashland County53,6280.57%
Darke County51,536-2.70%
Shelby County48,759-1.12%
Auglaize County45,778-0.33%
Logan County45,325-0.93%
Madison County44,0361.39%
Holmes County43,9573.49%
Brown County43,576-2.91%
Highland County42,971-1.47%
Fulton County42,289-0.79%
Clinton County42,0090.23%
Crawford County41,746-4.60%
Preble County41,120-2.50%
Mercer County40,8730.21%
Ottawa County40,657-1.69%
Guernsey County39,093-2.58%
Champaign County38,840-3.07%
Defiance County38,156-2.37%
Williams County36,784-1.93%
Coshocton County36,544-1.06%
Perry County36,024-0.04%
Morrow County34,9940.58%
Putnam County33,878-1.73%
Jackson County32,449-2.42%
Hardin County31,364-2.37%
Gallia County29,973-3.55%
Fayette County28,752-0.88%
Hocking County28,474-3.41%
Pike County28,270-1.64%
Van Wert County28,217-1.55%
Adams County27,726-2.88%
Carroll County27,385-5.07%
Henry County27,185-3.49%
Meigs County23,080-2.75%
Wyandot County22,029-2.46%
Paulding County18,845-3.67%
Harrison County15,216-3.85%
Morgan County14,709-2.25%
Noble County14,406-1.65%
Monroe County13,946-4.60%
Vinton County13,092-2.33%