[2] The county is named after the Ohio River, which originally formed its northern border.

It is a moist county, which means that the sale of alcohol is only legal within certain city limits.

In January 1865, during the American Civil War, the courthouse in Hartford was burned by Kentucky Confederate cavalry because it was being used to house soldiers of the occupying Union army.

Ohio County is part of the Western Coal Field region of Kentucky.

Much of Ohio County is farmland and the eastern and northern parts have rolling hills.

23.20% of all households were made up of individuals, and 11.10% had someone living alone who was 65 years of age or older.

Charter Communications is the county's primary cable television provider under the Spectrum name.

Additionally, the transmission facility of K-Love owned-and-operated radio station WEKV is located just south of Pleasant Ridge.