List of Ohio counties: (with county seats) 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)

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