Naperville is a city in DuPage County Illinois, in the Chicago metro area. The community straddles DuPage and Will County.
The estimated population, in 2003, was 137,894.

The number of violent crimes recorded by the FBI in 2003 was 0. The violent crime rate was per 1,000 people.
21% of residents report German ancestry, and 14% report Irish.

Naperville, Illinois Ranked No. 3 Best Place to Live by Money magazine, 2005.
According to the 2000 census, Naperville, Illinois had the lowest poverty rate (2.2%) among U.S. cities with populations of 100,000 or more
At the time of the 2000 census, the per capita income in Naperville was $35,551, compared with $45,787 in Illinois (2004).

61% of residents age 25 and older have a bachelor's or advanced college degree.

Median rent in Naperville, Illinois at the time of the 2000 Census, was $865. Monthly homeowner costs, for people with mortgages, were $1,831.