Ohio County Creation Dates and Parent Counties
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See an interactive outline map of Ohio Historical Boundary Changes - list of all boundary changes by county provided by Newberry Library[1] (Free) Enter a year, Refresh Map, select zoom in, then click on the map to enlarge it. |
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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[edit | edit source]
- ↑ [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.
