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Ohio Counties
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Want to adopt an Ohio County? Or maybe you are just interested in contributing to the site and helping others. Email me! or fill out our contact form located here. Note: If you would like to adopt a county or state, please go to About This Project for information on what is required for hosting a county or state. |
| COUNTY | DATE CREATED | ORIGIN | COUNTY SEAT | COORDINATOR |
| Adams | 10 Jul 1797 | Hamilton County | West Union | Adopt Me! |
| Allen | 01 Mar 1820 | Shelby County | Lima | Adopt Me! |
| Ashland | 24 Feb 1846 | Wayne, Richland, Huron, & Lorain Counties | Ashland | Adopt Me! |
| Ashtabula | 07 Jun 1807 | Trumbull & Geauga Counties | Jefferson | Adopt Me! |
| Athens |
01 Mar 1805 | Washington County | Athens | Adopt Me! |
| Auglaize |
14 Feb 1848 | Allen, Mercer, Darke, Hardin, Logan, Shelby & Van Wert Counties |
Wapakoneta | Adopt Me! |
| Belmont | 07 Sep 1801 | Jefferson & Washington Counties | St. Clairsville | Adopt Me! |
| Brown | 01 Mar 1818 | Adams & Clermont Counties | Georgetown | Adopt Me! |
| Butler | 01 May 1803 | Hamilton County | Hamilton | Adopt Me! |
Carroll  |
01 Jan 1833 | Columbiana, Stark, Harrison, Jefferson, & Tuscarawas Counties |
Carrollton | Adopt Me! |
| Champaign | 01 Mar 1805 | Greene & Franklin Counties | Urbana | Adopt Me! |
| Clark | 01 Mar 1818 | Champaign, Madison, & Greene Counties | Springfield | Adopt Me! |
| Clermont | 06 Dec 1800 | Hamilton County | Batavia | Adopt Me! |
| Clinton | 01 Mar 1810 | Highland & Warren Counties | Wilmington | Adopt Me! |
| Columbiana | 01 May 1803 | Jefferson & Washington Counties | Lisbon | Adopt Me! |
| Coshocton | 31 Jan 1810 | Muskingum & Tuscarawas Counties | Coshocton | Adopt Me! |
| Crawford | 01 Apr 1820 | Delaware County | Bucyrus | Adopt Me! |
| Cuyahoga | 07 Jun 1807 | Geauga County | Cleveland | Adopt Me! |
| Darke | 03 Jan 1809 | Miami County | Greenville | Adopt Me! |
| Defiance | 07 Apr 1845 | Williams, Henry & Paulding Counties | Defiance | Adopt Me! |
| Delaware | 01 Apr 1808 | Franklin County | Delaware | Adopt Me! |
| Erie | 15 Mar 1838 | Huron & Sandusky Counties | Sandusky | Adopt Me! |
| Fairfield | 09 Dec 1800 | Ross & Washington Counties | Lancaster | Adopt Me! |
| Fayette | 01 Mar 1810 | Ross & Highland Counties | Washington Courthouse | Adopt Me! |
| Franklin | 30 Apr 1803 | Ross & Wayne Counties | Columbus | Adopt Me! |
| Fulton | 01 Apr 1850 | Lucas, Henry, & Williams Counties | Wauseon | Adopt Me! |
| Gallia | 30 Apr 1803 | Washington & Adams Counties | Gallipolis | Adopt Me! |
| Geauga | 01 Mar 1806 | Trumbull County | Chardon | Adopt Me! |
| Greene | 01 May 1803 | Hamilton & Ross Counties | Xenia | Adopt Me! |
| Guernsey | 01 Mar 1810 | Belmont & Muskingum Counties | Cambridge | Valerie McNutt |
| Hamilton | 02 Jan 1790 | One of the original counties | Cincinnati | Adopt Me! |
| Hancock | 01 Apr 1820 | Logan County | Findlay | 
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| Hardin | 01 Apr 1820 | Logan County | Kenton | Adopt Me! |
| Harrison | 01 Feb 1813 | Jefferson & Tuscarawas Counties | Cadiz | Adopt Me! |
| Henry | 01 Apr 1820 | Shelby County | Napoleon | Adopt Me! |
| Highland |
01 May 1805 | Ross, Adams, & Clermont Counties | Hillsboro | Adopt Me! |
| Hocking | 01 Mar 1818 | Athens, Ross, & Fairfield Counties | Logan | Adopt Me! |
| Holmes | 20 Jan 1824 | Coshocton, Wayne, & Tuscarawas Counties | Millersburg | Adopt Me! |
| Huron | 07 Mar 1809 | Portage & Cuyahoga Counties | Norwalk | Adopt Me! |
| Jackson |
01 Mar 1816 | Scioto, Gallia, Athens, & Ross Counties | Jackson | Adopt Me! |
| Jefferson | 29 Jul 1797 | Washington County | Steubenville | Adopt Me! |
Knox  |
01 Mar 1808 | Fairfield County | Mount Vernon | Ohio State Team |
| Lake | 06 Mar 1840 | Geauga & Cuyahoga Counties | Painsville | Adopt Me! |
| Lawrence | 21 Dec 1815 | Gallia & Scioto Counties | Ironton | Adopt Me! |
| Licking | 01 Mar 1808 | Fairfield County | Newark | Adopt Me! |
| Logan | 01 Mar 1818 | Champaign County | Bellefontaine | Adopt Me! |
| Lorain | 26 Dec 1822 | Huron, Cuyahoga, & Medina Counties | Elyria | Adopt Me! |
| Lucas | 20 Jun 1835 | Wood, Sandusky, & Huron Counties | Toledo | Adopt Me! |
| Madison | 01 Mar 1810 | Franklin County | London | Adopt Me! |
| Mahoning | 01 Mar 1846 | Columbiana & Trumbull Counties | Youngstown | Adopt Me! |
| Marion | 01 Apr 1820 | Delaware County | Marion | Adopt Me! |
| Medina | 18 Feb1812 | Portage County | Medina | Adopt Me! |
| Meigs |
01 Apr 1819 | Gallia & Athens Counties | Pomeroy | Adopt Me! |
| Mercer |
01 Apr 1820 | Darke County | Celina | Ohio State Team |
| Miami | 01 Mar 1807 | Montgomery County | Troy | Adopt Me! |
| Monroe | 29 Jan 1813 | Belmont, Washington, & Guernsey Counties | Woodsfield | Adopt Me! |
| Montgomery |
01 May 1803 | Hamilton & Wayne Counties | Dayton | Adopt Me! |
| Morgan | 29 Dec 1817 | Washington, Guernsey, & Muskingum Counties | McConnelsville | Adopt Me! |
| Morrow | 01 Mar 1848 | Knox, Marion, Delaware, & Richland Counties | Mount Gilead | Adopt Me! |
| Muskingum | 01 Mar 1803 | Washington & Fairfield Counties | Zanesville | Valerie McNutt |
| Noble | 01 Apr 1851 | Monroe, Washington, Morgan, & Guernsey Counties | Caldwell | Adopt Me! |
| Ottawa | 01 Mar 1803 | Washington & Fairfield Counties | Port Clinton | Adopt Me! |
| Paulding | 01 Apr 1820 | Darke County | Paulding | Adopt Me! |
| Perry | 01 Mar 1818 | Washington, Fairfield, & Muskingum Counties | New Lexington | Adopt Me! |
| Pickaway | 01 Mar 1810 | Ross, Fairfield, & Franklin Counties | Circleville | Adopt Me! |
| Pike | 01 Feb 1815 | Ross, Scioto, & Adams Counties | Waverly | Adopt Me! |
| Portage | 07 Jun 1807 | Trumbull County | Ravenna | Adopt Me! |
| Preble | 01 Mar 1808 | Montgomery & Butler Counties | Eaton | Adopt Me! |
| Putman | 01 Apr 1820 | Shelby County | Ottawa | Adopt Me! |
| Richland | 01 Mar 1808 | Fairfield County | Mansfield | Adopt Me! |
| Ross | 20 Aug 1798 | Adams & Washington Counties | Chillicothe | Adopt Me! |
| Sandusky | 01 Apr 1820 | Huron County | Fremont | Adopt Me! |
| Scioto | 01 May 1803 | Adams County | Portsmouth | Adopt Me! |
| Seneca | 01 Apr 1820 | Huron County | Tiffin | Adopt Me! |
| Shelby | 01 Apr 1819 | Miami County | Sidney | Adopt Me! |
| Stark |
13 Feb 1808 | Columbiana County | Canton | Adopt Me! |
| Summit | 03 Mar 1840 | Medina, Portage, & Stark Counties | Akron | Adopt Me! |
| Trumbull | Jul 10, 1800 | Jefferson & Wayne Counties | Warren | Adopt Me! |
| Tuscarawas | 15 Mar 1808 | Muskingum County | New Philadelphia | Adopt Me! |
| Union | 01 Apr 1820 | Delaware, Franklin, Logan, & Madison Counties | Marysville | Adopt Me! |
| Van Wert |
01 Apr 1820 | Darke County | Van Wert | Adopt Me! |
| Vinton | 23 Mar 1850 | Athens, Gallia, Hocking, Jackson, & Ross Counties | McArthur | Adopt Me! |
| Warren | 01 May 1803 | Hamilton County | Lebanon | Adopt Me! |
| Washington | 27 Jul 1788 | One of the original counties | Marietta | Adopt Me! |
| Wayne |
01 Mar 1808 | From non-county area | Wooster | Adopt Me! |
| Williams | 01 Apr 1820 | Darke County | Bryan | Adopt Me! |
| Wood | 01 Apr 1820 | Refactored from non-county territory | Bowling Green | Adopt Me! |
| Wyandot | 03 Feb 1845 | Marion, Crawford, & Hardin Counties | Upper Sandusky | Adopt Me! |
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