La Grange, a suburb of Chicago, is a village in Cook County, in the U.S. state of Illinois. The population was 15,550 at the 2010 census. As of the census of 2000, there were 15,608 people, 5,624 households, and 4,049 families residing in the village. The population density was 6,220.7 people per square mile. There were 5,781 housing units at an average density of 2,304.1 per square mile. There were 5,624 households out of which 37.9% had children under the age of 18 living with them, 60.3% were married couples living together, 9.2% had a female householder with no husband present, and 28.0% were non-families. 24.5% of all households were made up of individuals and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.67 and the average family size was 3.23.
In the village the population was spread out with 28.5% under the age of 18, 4.8% from 18 to 24, 29.4% from 25 to 44, 23.8% from 45 to 64, and 13.5% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 94.2 males. For every 100 females age 18 and over, there were 87.4 males.
The median income for a household in the village was $80,342, and the median income for a family was $95,554. Males had a median income of $62,030 versus $41,260 for females. The per capita income for the village was $34,887. About 3.2% of families and 4.0% of the population were below the poverty line, including 4.3% of those under age 18 and 4.4% of those age 65 or over.