Round Lake Heights is a village in Lake County, Illinois, United States. The population was 2,676 at the 2010 census, up from 1,347 in 2000.
Round Lake Heights is located at 42°23′5″N 88°6′2″W (42.384821, -88.100525).
According to the 2010 census, Round Lake Heights has a total area of 0.607 square miles (1.57 km2), of which 0.57 square miles (1.48 km2) (or 93.9%) is land and 0.037 square miles (0.10 km2) (or 6.1%) is water.
As of the census of 2000, there were 1,347 people, 425 households, and 339 families residing in the village. The population density was 2,200.7 people per square mile (852.6/km2). There were 453 housing units at an average density of 740.1 per square mile (286.7/km2). The racial makeup of the village was 82.33% White, 2.08% African American, 0.15% Native American, 1.11% Asian, 0.07% Pacific Islander, 10.54% from other races, and 3.71% from two or more races. Hispanic or Latino of any race were 21.38% of the population.
There were 425 households, out of which 46.6% had children under the age of 18 living with them, 62.1% were married couples living together, 13.2% had a female householder with no husband present, and 20.2% were non-families. 14.6% of all households were made up of individuals, and 4.0% had someone living alone who was 65 years of age or older. The average household size was 3.17 and the average family size was 3.49.