Ohio Co., Origins Compiled by James W. Blankenship jkblank1(at)sbcglobal.net

July 13, 1787, Confederation Congress Created The Northwest Territory

Hamilton Created Jan 02 1790 from Original Northwest Territory

Washington Created Jul 27 1788 from Original Northwest Territory

Wayne Created 1796 from Original Northwest Territory

Adams Created July 10 1797 from Hamilton

Jefferson Created Jul 29 1797 from Washington

Ross Aug 20 1798 Adams, Washington

Trumbull Jul 10 1800 Connecticut Western Reserve

Clermont Created Dec 09 1800 from Hamilton

Fairfield Created Dec 09 1800 from Ross, Washington

Belmont Created Sep 01 1801 from Jefferson, Washington

Feb 19 1803 Ohio statehood

Allen Created Apr 01 1820 from Shelby

Ashland Created Feb 24 1846 from Wayne, Richland, Huron, Lorain

Ashtabula Created Feb 10 1807 from Trumbull, Geauga

Athens Created Feb 20 1805 from Washington

Auglaize Created Feb 14 1848 from Allen, Mercer, Darke, Hardin, Logan, Shelby, and Van Wert

Brown Created Dec 17 1817 from Adams, Clermont

Butler Created Mar 24 1803 from Hamilton

Carroll Created Dec 25 1832 from Columbiana, Stark, Harrison, Jefferson, Tuscarawas

Champaign Created Mar 01 1805 from Green, Franklin

Clark Created Dec 26 1817 from Champaign, Madison, Greene

Clinton Created Feb 19 1810 from Highland, Warren

Columbiana Created March 25 1803 from Jefferson, Washington

Coshocton Created Jan 31 1810 from Muskingum, Tuscarawas

Crawford Created Feb 20 1820 from Delaware

Cuyahoga Created Jan 16 1810 from Geauga

Darke Created Jan 03 1809 from Miami

Defiance Created March 04 1845 from Williams, Henry, Paulding

Delaware Created Feb 10 1808 from Franklin

Erie Mar Created 15 1838 from Huron, Sandusky

Fayette Created Feb 19 1810 from Ross, Highland

Franklin Created Mar 30 1803 from Ross

Fulton Created Feb 20 1850 from Lucas, Henry, Williams

Gallia Created Mar 25 1803 from Washington

Geauga Created Dec 31 1805 from Trumbull

Greene Created Mar 24 1803 from Hamilton, Ross

Guernsey Created Jan 31 1810 from Belmont, Muskingum

Hancock Created Feb 12 1820 from Logan

Hardin Created Feb 12 1820 from Logan

Harrison Created Jan 02 1813 from Jefferson, Tuscarawas

Henry Created Feb 12 1820 from Shelby

Highland Created Feb 18 1805 from Ross, Adams, Clermont

Hocking Created Jan 03 1818 from Athens, Ross, Fairfield

Holmes Created Jan 20 1824 from Coshocton, Wayne, Tuscarawas

Huron Created Feb 07 1809 from Portage, Cuyahoga

Jackson Created Feb 12 1816 from Scioto, Gallia, Athens, Ross

Knox Created Jan 30 1808 from Fairfield

Lake Created March 06 1840 from Geauga, Cuyahoga

Lawrence Created Dec 21 1815 from Gallia, Scioto

Licking Created Jan 30 1808 from Fairfield

Logan Created Dec 30 1817 from Champaign

Lorain Created Dec 26 1822 from Huron, Cuyahoga, Medina

Lucas Created Jun 20 1835 from Wood, Sandusky, Huron

Madison Created Feb 16 1810 from Franklin

Mahoning Created Feb 16 1846 from Columbiana, Trumbull

Marion Created Feb 12 1820 from Delaware

Medina Created Feb 12 1812 from Portage

Meigs Created Jan 21 1819 from Gallia, Athens

Mercer Created Feb 12 1820 from Darke

Miami Created Jan 16 1807 from Montgomery

Monroe Created Jan 29 1813 from Belmont, Washington, Guernsey

Montgomery Created Mar 24 1803 from Hamilton

Morgan Created Dec 29 1817 from Washington, Guernsey, Muskingum

Morrow Created Feb 24 1848 from Knox, Marion, Delaware, Richland

Muskingum Created Jan 07 1804 from Washington, Fairfield

Noble Created Mar 11 1851 from Monroe, Washington, Morgan, Guernsey

Ottawa Created Mar 06 1840 from Erie, Sandusky, Lucas

Paulding Created Feb 12 1820 from Darke

Perry Created Dec 26 1817 from Washington, Fairfield, Muskingum

Pickaway Created Jan 12 1810 from Ross, Fairfield, Franklin

Pike Created Jan 03 1815 from Ross, Scioto, Adams

Portage Created Feb 10 1807 from Trumbull

Preble Created Feb 15 1808 from Montgomery, Butler

Putnam Created Feb 12 1820 from Shelby

Richland Created Jan 07 1813 from Fairfield

Sandusky Created Feb 12 1820 from Huron

Scioto Created Mar 24 1803 from Adams

Seneca Created Feb 12 1820 from Huron

Shelby Created Jan 17 1819 from Miami

Stark Created Feb 13 1808 from Columbiana

Summit Created Mar 03 1840 from Connecticut Western Reserve

Tuscarawas Created Feb 13 1808 from Muskingum

Union Created Jan 10 1820 from Franklin, Madison, Logan, Delaware

VanWert Created Feb 12 1820 from Darke

Vinton Created Mar 23 1850 from Gallia, Athens, Ross, Jackson, Hocking

Warren Created Mar 24 1803 from Hamilton

Williams Created Feb 12 1820 from Darke

Wood Created Feb 12 1820 from Indian Lands

Wyandot Created Feb 03 1845 from Marion, Crawford, Hardin