Counties in Ohio Franklin County (Columbus) Cuyahoga County (Cleveland) Hamilton County (Cincinnati) Summit County (Akron) Montgomery County (Dayton) Lucas County (Toledo) Butler County (Hamilton) Stark County (Canton) Lorain County (Elyria) Warren County (Lebanon) Lake County (Painesville) Mahoning County (Youngstown) Delaware County (Delaware) Clermont County (Batavia) Trumbull County (Warren) Medina County (Medina) Licking County (Newark) Greene County (Xenia) Portage County (Ravenna) Fairfield County (Lancaster) Clark County (Springfield) Wood County (Bowling Green) Richland County (Mansfield) Wayne County (Wooster) Miami County (Troy) Allen County (Lima) Columbiana County (Lisbon) Ashtabula County (Jefferson) Geauga County (Chardon) Tuscarawas County (New Philadelphia) Muskingum County (Zanesville) Ross County (Chillicothe) Erie County (Sandusky) Hancock County (Findlay) Scioto County (Portsmouth) Belmont County (Saint Clairsville) Marion County (Marion) Jefferson County (Steubenville) Union County (Marysville) Knox County (Mount Vernon) Athens County (Athens) Washington County (Marietta) Sandusky County (Fremont) Huron County (Norwalk) Pickaway County (Circleville) Lawrence County (Ironton) Seneca County (Tiffin) Ashland County (Ashland) Darke County (Greenville) Shelby County (Sidney) Auglaize County (Wapakoneta) Logan County (Bellefontaine) Holmes County (Millersburg) Madison County (London) Brown County (Georgetown) Highland County (Hillsboro) Fulton County (Wauseon) Mercer County (Celina) Crawford County (Bucyrus) Clinton County (Wilmington) Preble County (Eaton) Ottawa County (Port Clinton) Champaign County (Urbana) Guernsey County (Cambridge) Defiance County (Defiance) Williams County (Bryan) Coshocton County (Coshocton) Perry County (New Lexington) Morrow County (Mount Gilead) Putnam County (Ottawa) Jackson County (Jackson) Hardin County (Kenton) Gallia County (Gallipolis) Fayette County (Washington Court House) Van Wert County (Van Wert) Hocking County (Logan) Henry County (Napoleon) Adams County (West Union) Pike County (Waverly) Carroll County (Carrollton) Meigs County (Pomeroy) Wyandot County (Upper Sandusky) Paulding County (Paulding) Harrison County (Cadiz) Noble County (Caldwell) Morgan County (McConnelsville) Monroe County (Woodsfield) Vinton County (McArthur)