Ohio county is in the Western Coal Field region of Kentucky. The elevation in the county ranges from 365 to 800 feet above sea level.
It was formed in 1799 from Hardin county. Ohio county was a source of Grayson (1810), Butler (1810), Daviess (1815), Hancock (1829), and McLean (1854) counties. The county seat is Hartford.
In 2020 the county population was 23,772 in a land area of 587.27 square miles, an average of 40.5 people per square mile.
The equine population was 1,000 in the 2012 Kentucky Equine Survey.
Ohio county is in the Green River Area Development District.
Ohio county was named for the Ohio River, which was its northern boundary until Daviess and Hancock counties were formed.
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© 2023 David C. Elbon