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December 9, 1778
- Createdon December 9, 1778 by Virginia to encompass all territory north and west of the Ohio River and east of the Mississippi River, claimed by Virginia on the basis of its 1609 charter.
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Mar 9, 2022 · Ohio County Creation Dates and Parent Counties. See an interactive outline map of Ohio Historical Boundary Changes at Newberry Library site. [1] Select a year and the map will display the historical county boundaries. Click on map image for county details.
Counties of Ohio. There are 88 counties in the U.S. state of Ohio. Nine of them existed at the time of the Ohio Constitutional Convention in 1802. A tenth county, Wayne, was established on August 15, 1796, and encompassed roughly the present state of Michigan.
CountyFips Code [10]County Seat [11]Est. [12]Jul 10, 1797Mar 1, 1820Feb 24, 1846Jun 7, 1807- Fun Facts About Ohio Counties
- Boundary Changes of Ohio Counties from 1788-1888
- List of Old Former / Extinct Ohio Counties
Counties by Year
1. Washington County was the original county created on July 27, 1788. 2. Noble County was the last county created on April 1, 1851.
County Size Facts
1. Ashtabula County(702 sq mi) is the largest county in Ohio. 2. Lake County(228 sq mi) is the smallest county in Ohio.
County Population Facts
1. Vinton County(13,435) is the least populated county in Ohio. 2. Franklin County(1,264,518) is the most populated county in Ohio.
This Interactive Map of Ohio Countiesshow the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from 1788 to 1888.
Ohio contains some counties that no longer exist because they were discontinued, renamed or merged with another county. These are important for genealogy research purposes. The belowcounties formerly within the area of the State of Ohiono longer exist:
The Continental Congress created the Northwest Territory on 13 Jul 1787. 1788: First organized European settlement in the Northwest Territory at Marietta (Washington Co., OH). Washington Co. formed as first county in the Northwest Territory (included most of what would become eastern and southeastern Ohio). 1790
YearEvent1770George Washington began surveying land ...1778In Virginia, Illinois Co. was formed from ...1785Treaty of Harmar addressed issues with ...1787The Continental Congress created the ...The history of Ohio as a state began when the Northwest Territory was divided in 1800, and the remainder reorganized for admission to the union on March 1, 1803, as the 17th state of the United States.
Many of the current eighty-eight counties, like Fulton, Mahoning, and Ashland, were not created until the mid-1800s. If you are researching a county that was created later, it is important to check the histo-ries of surrounding counties if you are researching Ohio’s early history.
The United States created the Territory of the United States Northwest of the River Ohio (Northwest Territory) from unorganized federal territory, to govern all territory west of Pennsylvania, north of the Ohio River, and east of the Mississippi River, to which states had ceded their colonial charter claims.
