Holly is a statutory town in Prowers County in southeastern Colorado, United States. The town is located 4.3 miles (6.9 km) west of the Kansas border at an elevation of 3,393 feet (1,034 m). Despite having the lowest elevation of any Colorado municipality, Holly is higher than the high points of 19 states and the District of Columbia. The town population was 837 at the 2020 United States Census.