Naperville is an affluent city in DuPage and Will counties in Illinois in the United States, voted the second best place to live in the United States by Money Magazine in 2006. The United States Census Bureau estimated the population in 2006 at 147,779. Naperville is the fifth largest city in the state, behind Chicago, neighboring Aurora, Rockford, and Joliet. Approximately 100,000 Napervillians live in DuPage County, while about 50,000 reside in Will County.

Once a quaint farming town, Naperville has evolved into a wealthy city due in part to a massive migration of professionals in the 1990's seeking jobs and globally renowned public schools. This can be seen in part by the enormous growth of high-tech companies such as Tellabs, Lucent Technologies and the BP North American Chemical Headquarters, all located in Naperville. With 150,000 Napervillians averaging $150,000 family incomes, the construction of thousands of multimillion dollar houses across the city has resulted, making Naperville the wealthiest city (with a population of 90,000 and over) in the entire country. U.S. News and World Report recently ranked both Naperville School District 203 high schools among the top 3 percent of high schools in the country. Also, District 204's Neuqua Valley High School and Waubonsie Valley High School won the Grammy Gold Signature School award in 2005 and 2007 respectively, ranking them top in the nation for a music program in a high school.