DuPage County, Illinois

DuPageCountyis a county located in the U.S. stateof Illinois. Its county seatis the city of Wheaton. This county is part of the Chicago metropolitan area. According to the 2010 census, it has a population of 916,924, which is an increase of 1.4% from 904,161 in 2000.[2]It is the second most populous county in Illinois after Cook County, which borders it to the north and east; the two counties account for half of the state's population. The county is divided into nine different townships: Addison, Bloomingdale, Downers Grove, Lisle, Milton, Naperville, Wayne, Winfieldand York. The majority of DuPage County is in the 630 and 331 area codes. However, the areas of the county that are in the city of Chicagoare in area code 773, primarily part of O'Hare International Airport.[3]

Long known as one of the nation's wealthiest counties, DuPage County has transformed itself from a primarily agricultural economy to one rich in many different types of commerce. Today, DuPage County has the highest per capita income in the state. DuPage County's per capita income is also the highest in the Midwest. Nineteen of the county's towns have average household incomes of over $100,000.

The most populous municipality within DuPage County is Naperville. The next largest communities are Wheatonand Downers Grove. A small portion of the City of Chicago is located within the county limits; however, this area is primarily commercial and, as of recent census estimates, has only 230 residents. It also has some of the city Aurora, which is within the county as well.