Ohio County Creation Dates and Parent Counties

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

References

  1. ↑ [http://historical-county.newberry.org/website/Ohio/viewer.htm Ohio Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
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