Crystal Lake is a medium-sized city located in the state of Illinois. With a population of 40,861 people and 12 associated neighborhoods, Crystal Lake is the 40th largest community in Illinois.

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

Also of interest is that Crystal Lake 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 Crystal Lake telecommute to their jobs. Overall, about 13.95% 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 education level of Crystal Lake ranks among the highest in the nation. Of the 25-and-older adult population in Crystal Lake, 41.97% have at least a bachelor's degree. The typical US community has just 21.84% of its adults holding a bachelor's degree or graduate degree.

The per capita income in Crystal Lake in 2022 was $46,199, which is wealthy relative to Illinois, and upper middle income relative to the rest of the US. This equates to an annual income of $184,796 for a family of four.

Crystal Lake is a somewhat ethnically-diverse city. The people who call Crystal Lake home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Crystal Lake residents report their race to be White, followed by Asian. Crystal Lake also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 12.10% of the city’s residents. Important ancestries of people in Crystal Lake include German, Irish, Polish, Italian, and English.

The most common language spoken in Crystal Lake is English. Other important languages spoken here include Spanish and Polish.