List of Ohio counties

List of Ohio counties: (with county seats)

• See Ohio state listing
• See List of Ohio Cities

Adams County (West Union, Ohio)

Allen County (Lima, Ohio)

Ashland County (Ashland, Ohio)

Ashtabula County (Jefferson, Ohio)

Athens County (Athens, Ohio)

Auglaize County (Wapakoneta, Ohio)

Belmont County (St. Clairsville, Ohio)

Brown County (Georgetown, Ohio)

Butler County (Hamilton, Ohio)

Carroll County (Carrollton, Ohio)

Champaign County (Urbana, Ohio)

Clark County (Springfield, Ohio)

Clermont County (Batavia, Ohio)

Clinton County (Wilmington, Ohio)

Columbiana County (Lisbon, Ohio)

Coshocton County (Coshocton, Ohio)

Crawford County (Bucyrus, Ohio)

Cuyahoga County (Cleveland, Ohio)

Darke County (Greenville, Ohio)

Defiance County (Defiance, Ohio)

Delaware County (Delaware, Ohio)

Erie County (Sandusky, Ohio)

Fairfield County (Lancaster, Ohio)

Fayette County (Washington Court House)

Franklin County (Columbus, Ohio, state capital)

Fulton County (Wauseon, Ohio)

Gallia County (Gallipolis, Ohio)

Geauga County (Chardon, Ohio)

Greene County (Xenia, Ohio)

Guernsey County (Cambridge, Ohio)

Hamilton County (Cincinnati, Ohio)

Hancock County (Findlay, Ohio)

Hardin County (Kenton, Ohio)

Harrison County (Cadiz, Ohio)

Henry County (Napoleon, Ohio)

Highland County (Hillsboro, Ohio)

Hocking County (Logan, Ohio)

Holmes County (Millersburg, Ohio)

Huron County (Norwalk, Ohio)

Jackson County (Jackson, Ohio)

Jefferson County (Steubenville, Ohio)

Knox County (Mount Vernon, Ohio)

Lake County (Painesville, Ohio)

Lawrence County (Ironton, Ohio)

Licking County (Newark, Ohio)

Logan County (Bellefontaine, Ohio)

Lorain County (Elyria, Ohio)

Lucas County (Toledo, Ohio)

Madison County (London, Ohio)

Mahoning County (Youngstown, Ohio)

Marion County (Marion, Ohio)

Medina County (Medina, Ohio)

Meigs County (Pomeroy, Ohio)

Mercer County (Celina, Ohio)

Miami County (Troy, Ohio)

Monroe County (Woodsfield, Ohio)

Montgomery County (Dayton, Ohio)

Morgan County (McConnelsville, Ohio)

Morrow County (Mount Gilead, Ohio)

Muskingum County (Zanesville, Ohio)

Noble County (Caldwell, Ohio)

Ottawa County (Port Clinton, Ohio)

Paulding County (Paulding, Ohio)

Perry County (New Lexington, Ohio)

Pickaway County (Circleville, Ohio)

Pike County (Waverly)

Portage County (Ravenna, Ohio)

Preble County (Eaton, Ohio)

Putnam County (Ottawa, Ohio)

Richland County (Mansfield, Ohio)

Ross County (Chillicothe, Ohio)

Sandusky County (Fremont, Ohio)

Scioto County (Portsmouth, Ohio)

Seneca County (Tiffin, Ohio)

Shelby County (Sidney, Ohio)

Stark County (Canton, Ohio)

Summit County (Akron, Ohio)

Trumbull County (Warren, Ohio)

Tuscarawas County (New Philadelphia, Ohio)

Union County (Marysville, Ohio)

Van Wert County (Van Wert, Ohio)

Vinton County (McArthur, Ohio)

Warren County (Lebanon, Ohio)

Washington County (Marietta, Ohio)

Wayne County (Wooster, Ohio)

Williams County (Bryan, Ohio)

Wood County (Bowling Green, Ohio)

Wyandot County (Upper Sandusky, Ohio)