
Rockcastle County
- State:
- Kentucky
- County Seat:
- Mount Vernon
Rockcastle County's estimated 2025 population is 16,120 with a growth rate of -0.22% in the past year according to the most recent United States census data. Rockcastle County is the 70th largest county in Kentucky. The 2010 population was 17,086 and has seen a growth of -5.65% since that time.