Fayette County is home to Lexington, Kentucky's second-largest city and the heart of the Bluegrass Region. Known for horse farms, rolling pastures, and strong land values, Fayette County offers urban amenities alongside agricultural heritage. County seat: Lexington. Hart County is a Central Kentucky county centered on Munfordville along the Green River. Civil War history, affordable farmland, and a central location between Louisville and Bowling Green define the area.