Lake Forest is a city located in Lake County, Illinois, United States. As of the 2010 census it had a population of 19,375. The city is along the shore of Lake Michigan, and is a part of the Chicago metropolitan area and the North Shore.
Lake Forest is located in the North Shore area of Chicago, at 42°14′5″N 87°51′3″W / 42.23472°N 87.85083°W / 42.23472; -87.85083 (42.234788, -87.851042).
According to the 2010 census, Lake Forest has a total area of 17.246 square miles (44.67 km), of which 17.18 square miles (44.50 km) (or 99.62%) is land and 0.066 square miles (0.17 km) (or 0.38%) is water.
As of the 2010 United States Census, there were 19,375 people residing in the city. The racial makeup of the city was 92.11% White, 4.67% Asian, 2.80% Hispanic or Latino (of any race), 1.30% of two or more races, 1.10% Black or African American, 0.14% Native American, 0.01% Pacific Islander, and 0.68% of some other race.
As of the census of 2000, there were 20,059 people, 6,687 households, and 5,329 families residing in the city. The population density was 1,189.4 people per square mile (459.1/km²). There were 7,001 housing units at an average density of 415.1 per square mile (160.2/km²). The racial makeup of the city was 95.80% White, 1.35% African American, 0.06% Native American, 2.45% Asian, 0.13% Pacific Islander, 0.44% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 0.87% of the population.
There were 6,687 households out of which 39.0% had children under the age of 18 living with them, 73.6% were married couples living together, 4.7% had a female householder with no husband present, and 20.3% were non-families. Of all households 18.3% Of all households were made up of individuals and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.17.
In the city, the population was spread out with 27.5% under the age of 18, 9.6% from 18 to 24, 19.7% from 25 to 44, 28.6% from 45 to 64, and 14.6% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 90.8 males. For every 100 females age 18 and over, there were 86.5 males.
According to a 2007 estimate, the median income for a household in the city was $150,670, and the median income for a family was more than $200,000. Males had a median income of $100,000+ versus $44,083 for females. The per capita income for the city was $77,092. About 0.15% of families and 0.2% of the population were below the poverty line.