Harts is located at 38°1'51" North, 82°7'45" West (38.031111, -82.129444).
According to the United States Census Bureau, the city has a total area of 30.26 mi2 (78.38 km2). 29.93 mi2 (77.52 km2) of it is land and 0.33 mi2 (0.86 km2) of it is covered by water. The total area is 1.10% water.
Harts is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).