O'Fallon is a medium-sized city located in the state of Illinois. With a population of 32,140 people and seven associated neighborhoods, O'Fallon is the 59th largest community in Illinois.

O'Fallon real estate is some of the most expensive in Illinois, although O'Fallon house values don't compare to the most expensive real estate in the U.S.

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

Telecommuters are a relatively large percentage of the workforce: 13.02% of people work from home. While this number may seem small overall, as a fraction of the total workforce it is high relative to the nation. 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.

Because of many things, O'Fallon is a great place for families with children to consider. First of all, many other families with children live here, making O'Fallon a place where both parents and children are more likely to develop social ties with other families, as well as find family-oriented services and community. The city’s good public school district and large population of college-educated adults provide an environment conducive to academic values. With regard to real estate, O'Fallon has a high rate of owner-occupied single family homes, which tends to reflect stability in the local community. Finally, O'Fallon’s overall crime rate is lower than average for the country.

If knowledge is power, O'Fallon is a pretty powerful place. 50.55% of the adults in O'Fallon have earned a 4-year college degree, masters degree, MD, law degree, or even PhD. Compare that to the national average of 21.84% for all cities and towns.

The per capita income in O'Fallon in 2022 was $47,901, which is wealthy relative to Illinois and the nation. This equates to an annual income of $191,604 for a family of four.

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

The most common language spoken in O'Fallon is English. Other important languages spoken here include Spanish and German/Yiddish.