Lake Barrington is a village in Lake County, Illinois, United States. The population was 4,973 at the 2010 census.
Lake Barrington is located at 42°12′45″N 88°10′05″W (42.2125330, -88.1680526). The village is also situated on the shores of Lake Barrington, which was previously called Indian Lake, located at 42°12′54″N 88°08′49″W.
According to the 2010 census, Lake Barrington has a total area of 6.167 square miles (15.97 km2), of which 5.86 square miles (15.18 km2) (or 95.02%) is land and 0.307 square miles (0.80 km2) (or 4.98%) is water.
At the 2000 census there were 4,757 people, 2,039 households, and 1,455 families living in the village of Lake Barrington. The population density was 891.6 people per square mile (343.9/km2). There were 2,116 housing units at an average density of 396.6 per square mile (153.0/km2). The racial makeup of the village was 97.41% White, 0.42% African American, 0.19% Native American, 1.07% Asian, 0.06% Pacific Islander, 0.15% from other races, and 0.69% from two or more races. Hispanic or Latino of any race were 0.99%.
Of the 2,039 households, 23.7% had children under the age of 18 living with them, 65.8% were married couples living together, 3.9% had a female householder with no husband present, and 28.6% were non-families. 25.6% of households were one person and 9.3% were one person aged 65 or older. The average household size was 2.33 and the average family size was 2.80.
The age distribution was 20.4% under the age of 18, 3.5% from 18 to 24, 17.7% from 25 to 44, 40.4% from 45 to 64, and 17.9% 65 or older.