If you are researching ancestors who you believed resided within the present day boundaries of Hart County, you need to take into account where they lived and the changes in the county lines. From 1793 - 1819 you may find ancestors North of the Green River in Hardin County.
South of the Green River, they will be found in Warren County from 1792 - 1796, in Logan County from 1796 - 1799, and in Barren County from 1799 - 1819.
Hart was created from Hardin and Barren counties in 1819.
Previous to 1793, search Nelson and Lincoln Counties.