Holiday Hills is a village in McHenry County, Illinois, United States. Per the 2020 census, the population was 618. Holiday Hills is located at 42°17′38″N 88°13′37″W / 42.29389°N 88.22694°W. According to the 2010 census, Holiday Hills has a total area of 0.99 square miles, of which 0.95 square miles is land and 0.04 square miles is water.