Belleville is a medium-sized city located in the state of Illinois. With a population of 41,295 people and 17 associated neighborhoods, Belleville is the 37th largest community in Illinois.

Also of interest is that Belleville has more people living here who work in computers and math than 95% of the places in the US.

A relatively large number of people in Belleville telecommute to their jobs. Overall, about 8.59% of the workforce works from home. While this may seem like a small number, as a fraction of the total workforce it ranks among the highest in the country. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

The overall education level of Belleville is somewhat higher than in the average US city of 21.84%: 26.37% of adults 25 and older in the city have at least a bachelor's degree.

The per capita income in Belleville in 2022 was $31,798, which is middle income relative to Illinois and the nation. This equates to an annual income of $127,192 for a family of four. However, Belleville contains both very wealthy and poor people as well.

Belleville is an extremely ethnically-diverse city. The people who call Belleville home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Belleville residents report their race to be White, followed by Black or African-American. Important ancestries of people in Belleville include German, Irish, English, Italian, and Polish.

The most common language spoken in Belleville is English. Other important languages spoken here include Spanish and Arabic.