Elmhurst is a city mostly in DuPage County and overlapping into Cook County in the U.S. state of Illinois, and a western suburb of Chicago. As of the 2017 census, the city has a population of 46,662.
According to the 2010 census, Elmhurst has a total area of 10.306 square miles (26.69 km), of which 10.25 square miles (26.55 km) (or 99.46%) is land and 0.056 square miles (0.15 km) (or 0.54%) is water.
The town also has a tendency to flood, and the city has tried preventing or suppressing this for the future.
As of the 2000 census, there were 42,762 people, 15,627 households, and 11,235 families residing in the city. The population density was 4,165.9 people per square mile (1,609.2/km²). There were 16,147 housing units at an average density of 1,573.1 per square mile (607.6/km²). The racial makeup of the city was 93.40% White, 0.94% African American, 0.06% Native American, 3.67% Asian, 0.02% Pacific Islander, 0.97% from other races, and 0.95% from two or more races. Hispanic or Latino of any race were 4.02% of the population.
There were 15,627 households out of which 33.9% had children under the age of 18 living with them, 62.0% were married couples living together, 7.4% had a female householder with no husband present, and 28.1% were non-families. 24.6% of all households were made up of individuals and 11.4% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 3.19.
In the city, the population was spread out with 25.6% under the age of 18, 7.0% from 18 to 24, 28.5% from 25 to 44, 23.0% from 45 to 64, and 16.0% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 92.5 males. For every 100 females age 18 and over, there were 87.4 males.
According to a 2016 estimate, the median income for a household in the city was $104,854 Males had a median income of $57,193 versus $37,087 for females. The per capita income for the city was $44,601. About 1.9% of families and 2.5% of the population were below the poverty line, including 2.6% of those under age 18 and 3.3% of those age 65 or over.