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Ohio Counties

County Date County Formation County Seat Coordinator Forum?
Adams 1797 Hamilton County West Union    
Allen 1820 Shelby County Lima    
Ashland 1846 Huron, Lorain and Richland Counties Ashland    
Ashtabula 1807 Geauga and Trumbull Counties Jefferson    
Athens 1805 Washington County Athens Active
Auglaize 1848 Allen, Darke, Hardin, Logan, Mercer, Shelby and Van Wert Counties Wapakoneta    
Belmont 1801 Jefferson and Washington Counties St. Clairsville    
Brown 1818 Adams and Clermont Counties Georgetown    
Butler 1803 Hamilton County Hamilton Active
Carroll 1833 Columbiana, Harrison, Jefferson, Stark and Tuscarawas Counties Active
Champaign 1805 Franklin and Greene Counties Urbana    
Clark 1818 Champaign, Greene and Madison Counties Springfield    
Clermont 1900 Hamilton County Batavia    
Clinton 1810 Highland and Warren Counties Wilmington    
Columbiana 1803 Jefferson and Washington Counties Lisbon    
Coshocton 1810 Muskingum and Tuscarawas Counties Coshocton    
Crawford 1820 Delaware County Bucyrus    
Cuyahoga 1807 Geauga County Cleveland    
Darke 1809 Miami County Greenville    
Defiance 1845 Henry, Paulding and Williams Counties Defiance    
Delaware 1808 Franklin County Delaware    
Erie 1838 Huron and Sandusky Counties Sandusky    
Fairfield 1800 Ross and Washington Counties Lancaster Active
Fayette 1800 Highland and Ross Counties Washington Courthouse    
Franklin 1803 Ross and Wayne Counties Colmbus    
Fulton 1850 Henry, Lucas and Williams Counties Wauseon    
Gallia 1803 Adams and Washington Counties Gallipolis    
Geauga 1806 Trumbull County Chardon    
Greene 1803 Hamilton and Ross Counties Xenia    
Guernsey 1810 Belmont and Muskingum Counties Cambridge    
Hamilton 1790 Original County Cincinnati    
Hancock 1820 Logan County Findlay Diane Active
Hardin 1820 Logan County Kenton    
Harrison 1813 Jefferson and Tuscarawas Counties Cadiz    
Henry 1820 Shelby County Napoleon Active
Highland 1805 Adams, Clermont and Ross Counties Hillsboro Active
Hocking 1818 Athens, Clermont and Ross Counties Logan    
Holmes 1824 Coshocton, Tuscarawas and Wayne Counties Millersburg    
Huron 1809 Cuyahoga and Portage Counties Norwalk    
Jackson 1816 Athens, Gallia, Ross and Scioto Counties Jackson    
Jefferson 1797 Washington County Steubenville    
Know 1808 Fairfield County Mount Vernon    
Lake 1840 Cuyahoga and Geauga Counties    
Lawrence 1815 Gallia and Scioto Counties Ironton    
Licking 1808 Fairfield County Newark    
Logan 1818 Champaign County Bellefontaine    
Lorain 1822 Cuyahoga, Huron and Medina Counties Elyria    
Lucas 1835 Huron, Sandusky and Wood Counties Toledo Active
Madison 1810 Franklin County London    
Mahoning 1846 Columbiana and Trumbull Counties Youngstown    
Marion 1820 Delaware County Marion    
Medina 1812 Portage County Medina    
Meigs 1819 Athens and Gallia Counties Pomeroy Active
Mercer 1820 Darke County Celina    
Miami 1807 Montgomery County Troy    
Monroe 1813 Belmont, Guernsey and Washington Counties Woodsfield    
Montgomery 1803 Hamilton and Wayne Counties Dayton Active
Morgan 1817 Guernsey, Muskingum and Washington Counties McConnelsville    
Morrow 1848 Delaware, Know, Marion and Richland Counties Mount Gilead    
Muskingum 1803 Fairfield and Washington Counties Zanesville    
Noble 1851 Guernsey, Monroe, Morgan and Washington Counties Caldwell    
Ottawa 1803 Fairfield and Washington Counties Port Clinton    
Paulding 1820 Darke County Paulding    
Perry 1818 Fairfield, Muskingum and Washington Counties New Lexington    
Pickaway 1810 Fairfield, Franklin and Ross Counties Circleville    
Pike 1815 Adams, Ross and Scioto Counties Waverly    
Portage 1807 Trumbull County Ravenna    
Preble 1808 Butler and Montgomery Counties Eaton    
Putnam 1820 Shelby County Ottawa    
Richland 1808 Fairfield County Mansfield    
Ross 1798 Adams and Washington Counties Chillicothe    
Sandusky 1820 Huron County Fremont    
Scioto 1803 Adams County Portsmouth    
Seneca 1820 Huron County Tiffin    
Shelby 1819 Miami County Sidney    
Stark 1808 Columbiana County Canton Active
Summit 1840 Medina, Portage and Stark Counties Akron    
Trumbull 1800 Jefferson and Wayne Counties Warren    
Tuscarawas 1808 Muskingum County New Philadelphia    
Union 1820 Delaware, Franklin, Logan and Madison Counties Marysville    
Van Wert 1820 Darke County Van Wert    
Vinton 1850 Athens, Gallia, Hocking, Jackson and Ross Counties McArthur    
Warren 1803 Hamilton County Lebanon    
Washington 1788 Original County Marietta    
Wayne 1808 Non-county area Wooster Active
Williams 1820 Darke County Bryan    
Wood 1820 Non-county area Bowling Green    
Wyandot 1845 Crawford, Hardin and Marion Counties Upper Sandusky