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  1. 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.

  2. 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.

    County
    Fips Code [10]
    County Seat [11]
    Est. [12]
    Jul 10, 1797
    Mar 1, 1820
    Feb 24, 1846
    Jun 7, 1807
  3. Jul 4, 2024 · View this 1820 Historical Ohio Counties map tool. The historical Ohio counties will be displayed on the map, and you can also overlay present day counties, townships and more.

    • 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:

  4. This Interactive Map of Ohio Counties show the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from the creation of the Ohio territory in 1788 to 1888.

  5. Jun 4, 2024 · The first counties were created in 1799, shortly after Ohio became a state. The number of counties has changed over time, with some counties being created and others being consolidated. The current number of 88 counties was set in 1808.

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  7. Maps and text covering the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from the creation of the first county through December 31, 2000. For help with the interactive maps, see our Using the Atlas page.

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