Ohio County Creation Dates and Parent CountiesEdit This Page
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United States > Ohio > Ohio County Creation Dates and Parent Counties
| Name of County | Date Formed | Parent County | Progeny County |
| Adams | 10 Jul 1797 | Hamilton | Brown 1817, Gallia 1803, Highland 1805, Pike 1815, Ross 1789, Scioto 1803 |
| Allen | 12 Feb 1820 | Shelby | Auglaize 1848 |
| Ashland | 24 Feb 1846 | Wayne, Richland, Huron, Lorain | none |
| Ashtabula | 10 Feb 1807 | Trumbull, Geauga | none |
| Athens | 20 Feb 1805 | Washington | Hocking 1818, jackson 1816, Meigs 1819, Vinton 1850 |
| Auglaize | 14 Feb1848 | Allen, Mercer | none |
| Belmont | 07 Sep 1801 | Jefferson, Washington | Guernsey 1810 |
| Brown | 27 Dec 1817 | Adams, Clermont | none |
| Butler | 24 Mar 1803 | Hamilton | Preble 1808 |
| Carroll | 25 Dec 1832 | Columbia, Stark, Harrison, Jefferson, Tuscarawas | none |
| Champaign | 20 Feb 1805 | Greene, Franklin | Clark 1817, Logan 1818 |
| Clark | 26 Dec 1817 | Champaign, Madison, Greene | none |
| Clermont | 06 Dec 1800 | Hamilton | Brown 1817, Highland 1805 |
| Clinton | 19 Feb1 810 | Highland, Warren | none |
| Columbiana | 25 Mar 1803 | Jefferson, Washington | Carroll 1832, Mahoning 1846, Stark 1808, Wayne 1796 |
| Coshocton | 31 Jan 1810 | Muskingum, Tuscarawas | Holmes 1824 |
| Crawford | 12 Feb 1820 | Delaware | Wyandot 1845 |
| Cuyahoga | 10 Feb 1808 | Geauga | Huron 1809, Lake 1840, Lorain 1822 |
| Darke | 03 Jan 1809 | Miami | Mercer 1820, Paulding 1820, Van Wert 1820, Williams 1820 |
| Defiance | 04 Mar 1845 | Williams, henry, Paulding | none |
| Delaware | 10 Feb 1808 | Franklin | Crawford 1820, Marion 1820, Morrow 1848, Union 1820 |
| Erie | 15 Mar 1838 | Huron, Sandusky | Ottawa 1840 |
| Fairfield | 09 Dec 1800 | Ross, Washington | Hocking 1818, Knox 1808, Licking 1808, Muskingum 1804, Perry 1817, Pickaway 1810, Richland 1808 |
| Fayette | 19 Feb 1810 | Ross, Highland | none |
| Franklin | 30 Mar 1803 | Ross, Wayne | Champaign 1805, Delaware 1808, Madison 1810, Union 1820, Pickaway 1810 |
| Fulton | 28 Feb 1850 | Lucas, Henry, Williams | none |
| Gallia | 28 Feb 1850 | Washington, Adams | Jackson 1816, Lawrence 1815, Meigs 1819, Vinton 1850 |
| Geauga | 31 Dec 1805 | Trumbull | Ashtabula 1807, Cuayhoga 1808, Lake 1840 |
| Greene | 24 Mar 1803 | Hamilton, Ross | Champaign 1805, Clark 1817 |
| Guernsey | 31 Jan 1810 | Belmont, Muskingum | Monroe 1813, Morgan 1817, Noble 1851 |
| Hamilton | 02 Jan 1790 | Northwest Territory | Adams 1797, Butler 1803, Clermont 1800, Greene, 1803, Warren 1803 |
| Hancock | 12 Feb 1820 | Logan | Wyandot 1845 |
| Hardin | 12 Feb 1820 | Logan | Wyandot 1845 |
| Harrison | 02 Jan 1813 | Jefferson, Tuscarawas | Carroll 1832 |
| Henry | 12 Feb 1820 | Shelby | Defiance 1845, Fulton 1850, Lucas 1835 |
| Highland | 18 Feb 1805 | Ross, Adams, Clermont | Clinton 1810, Fayette 1810 |
| Hocking | 03 Jan 1818 | Athens, Ross, Fairfield | Vinton 1850 |
| Holmes | 20 Jan 1824 | Coshocton, Wayne, Tuscarawas | none |
| Huron | 07 Feb 1809 | Portage, Cuyahoga | Ashland 1846, Erie 1838, Lorain 1822, Seneca 1820, Sandusky 1820 |
| Jackson | 12 Jan 1815 | Scioto, Galla, Athens, Ross | Vinton 1850 |
| Jefferson | 27 Jul 1797 | Washington | Belmont 1801, Carroll 1832, Harrison 1813, Trumbull 1800, Columbiana 1803 |
| Knox | 30 Jan 1808 | Fairfield | Morrow 1848 |
| Lake | 06 Mar 1840 | Geauga, Cuyahoga | none |
| Lawrence | 21 Dec 1815 | Gallia, Scioto | none |
| Licking | 30 Jan 1808 | Fairifled | none |
| Logan | 30 Dec 1818 | Champaign | Hancock 1820, Hardin 1820, Union 1820, Wood 1820 |
| Lorain | 26 Dec 1822 | Huron, Cuyahoga, Medina | Ashland 1846 |
| Lucas | 20 Jun 1835 | Wood, Sandusky, Henry | Fulton 1850, Ottawa 1840 |
| Madison | 16 Feb 1810 | Franklin | Clark 1817, Union 1820 |
| Mahoning | 16 Feb 1846 | Columbiana, Trumbull | none |
| Marion | 12 Feb 1820 | Delaware | Morrow 1848, Wyandot 1845 |
| Medina | 18 Feb 1812 | Portage | Lorain 1822, Summit 1840 |
| Meigs | 21 Jan 1819 | Gallia, Athens | none |
| Mercer | 12 Feb 1820 | Darke | Auglaize 1848 |
| Miami | 16 Jan 1807 | Montgomery | Darke 1809, Shelby 1819 |
| Monroe | 29 Jan 1813 | Guernsey | Noble 1851 |
| Montgomery | 24 Mar 1803 | Hamilton, Wayne | Miami 1807, Preble 1808 |
| Morgan | 29 Dec 1817 | Washington, Guernsey, Muskingum | Noble 1851 |
| Morrow | 24 Feb 1848 | Knox, Delaware, Marion, Richland | none |
| Muskingum | 07 Jan 1804 | Washington, Fairfield | Coshocton 1810, Guernsey 1810, Morgan 1817, Fairfield 1817, Tuscarawas 1808 |
| Noble | 11 Mar 1851 | Monroe, Washington, Morgan, Guernsey | none |
| Ottawa | 06 Mar 1840 | Erie, Sandusky, Lucas | none |
| Paulding | 12 Feb 1820 | Drake | Defiance 1845 |
| Perry | 26 Dec 1817 | Washington, Fairfield, Muskingum | none |
| Pickaway | 12 Jan 1810 | Ross, Fairfield, Franklin | none |
| Pike | 04 Jan 1815 | Ross, Adams, Scioto | none |
| Portage | 10 Feb 1807 | Trumbull | Huron 1809, Medina 1812, Summit 1840 |
| Preble | 15 Feb 1808 | Montgomery, Butler | none |
| Putnam | 12 Feb 1820 | Shelby | none |
| Richland | 30 Jan 1808 | Fairfield | Ashland 1846, Morrow 1848 |
| Ross | 20 Aug 1798 | Adams, Washington | Fairfield 1800, Fayette 1810, Pike 1815, Franklin 1803, Greene 1803, Highland 1805, Hocking 1818, Jackson 1816, Pickaway 1810, Vinton 1850 |
| Sandusky | 12 Feb 1820 | Huron | Erie 1838, Lucas 1835, Ottawa 1840 |
| Scioto | 24 Mar 1803 | Adams | Jackson 1816, Lawrence 1815, Pike 1815 |
| Seneca | 12 Feb 1820 | Huron | none |
| Shelby | 07 Jan 1819 | Miami | Allen 1820, Henry 1820, Putnam 1820 |
| Stark | 13 Feb 1808 | Columbiana | Carroll 1832, Summit 1840 |
| Summit | 03 Mar 1840 | Portage, Medina, Stark | none |
| Trumbull | 10 Jul 1800 | Jefferson, Wayne | Ashtabula 1807, Geauga 1805, Portage 1807,Mahoning 1846 |
| Tuscarawas | 13 Feb 1808 | Muskingum | Carroll 1832, Coshocton 1810, Holmes 1824, Harrison 1813 |
| Union | 10 Jan 1820 | Franklin, Madison, Logan, Delaware | none |
| Van Wert | 12 Feb 1820 | Drake | none |
| Vinton | 23 Mar 1850 | Gallia, Athens, Ross, Jackson, Hocking | none |
| Warren | 24 Mar 1803 | Hamilton | Clinton 1810 |
| Washington | 27 Jul 1788 | Northwest Territory | Athens 1805, Belmont 1801, Columbiana 1803, Fairfield 1800, Gallia 1803, Jefferson 1797, Monroe 1813, Morgan 1817, Muskingum 1804, Nole 1851, Perry 1817, Ross 1798 |
| Wayne | 15 Aug 1796 | Columbia | Ashland 1846, Holmes 1824 |
| Williams | 2 Feb 1820 | Drake | Defiance 1845, Fulton 1850 |
| Wood | 12 Feb 1820 | Logan | Lucas 1835 |
| Wyandot | 03 Feb 1845 | Marion, Crawford, Hardin, Hancock | none |
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