Ohio County Creation Dates and Parent CountiesEdit This Page

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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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