In 2010 the county population was 17,056 in a land area of 316.55 square miles, an average of 53.9 people per square mile.
The equine population was 800 in the 2012 Kentucky Equine Survey.
Rockcastle county is in the Cumberland Valley Area Development District.
Rockcastle county was named for the Rockcastle River, which forms its southeastern boundary. The river was named for its tall rock formations.
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© 2019 David C. Elbon