Allen county is in the Pennyrile region of Kentucky. The elevation in the county ranges from 445 to 966 feet above sea level.
It was formed in 1815 from Warren and Barren counties. Allen county was a source of Warren (1816) and Simpson (1819) counties. The county seat is Scottsville.
In 2020 the county population was 20,588 in a land area of 344.34 square miles, an average of 59.8 people per square mile.
The equine population was 2,400 in the 2012 Kentucky Equine Survey.
Allen county is in the Bowling Green metro statistical area and the Barren River Area Development District.
Allen county was named for Colonel John Allen, member of the Kentucky Senate killed at the Battle of Frenchtown during the War of 1812.
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