right|thumb|350px|Fylker i Ohio Liste over fylker i Ohio. Den amerikanske delstaten Ohio består av 88 fylker.
FylkeGrunnlagtHovedsete Adams County 1797 West Union Allen County 1820 Lima Ashland County 1846 Ashland Ashtabula County 1807 Jefferson Athens County 1805 Athens Auglaize County 1848 Wapakoneta Belmont County 1801 St. Clairsville Brown County 1818 Georgetown Butler County 1803 Hamilton Carroll County 1833 Carrollton Champaign County 1805 Urbana Clark County 1818 Springfield Clermont County 1800 Batvia Clinton County 1810 Wilmington Columbiana County 1803 Lisbon Coshocton County 1810 Coshocton Crawford County 1820 Bucyrus Cuyahoga County 1807 Cleveland Darke County 1808 Greenville Defiance County 1845 Defiance Delaware County 1808 Delaware Erie County 1838 Sandusky Fairfield County 1800 Lancaster Fayette County Washington Franklin County 1803 Columbus Fulton County 1850 Wauseon Gallia County 1803 Gallipolis Geauga County 1806 Chardon Greene County Xenia Guernsey County CambridgeHamilton County Cincinnati Hancock County Findlay Hardin County Kenton Harrison County Cadiz Henry County Napoleon Highland County Hillsboro Hocking County Logan Holmes County Millersburg Huron County Norwalk Jackson County Jackson Jefferson County Steubenville Knox County Mount Vernon Lake County Painesville Lawrence County Ironton Licking County Newark Logan County Bellefontaine Lorain County Elyria Lucas County Toledo Madison County London Mahoning County Youngstown Marion County Marion Medina County Medina Meigs County Pomeroy Mercer County Celina Miami County Troy Monroe County Woodsfield Montgomery County Dayton Morgan County McConnelsville Morrow County Mount Gilead Muskingum County Zanesville Noble County Cladwell Ottawa County Port Clinton Paulding County Paulding Perry County New Lexington Pickaway County Circleville Pike County Waverly Portage County Ravenna Preble County Eaton Putnam County Ottawa Richland County Mansfield Ross County Chillicothe Sandusky County Fremont Scioto County Portsmouth Seneca County Tiffin Shelby County Sidney Stark County Canton Summit County Akron Trumbull County Warren Tuscarawas County New Philadelphia Union County Marysville Van Wert County Van Wert Vinton County McArthur Warren County Lebanon Washington County Marietta Wayne County Wooster Williams County Bryan Wood County Bowling Green Wyandot County Upper Sandusky
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Ohio