Lake St. Louis is a medium-sized city located in the state of Missouri. With a population of 18,337 people and four associated neighborhoods, Lake St. Louis is the 45th largest community in Missouri.

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

Also of interest is that Lake St. Louis 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: 16.09% 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.

Lake St. Louis is a good choice for families with children because of several factors. Many other families with children live here, making it a place where both parents and children are more likely to develop social ties with other families. The city’s good public school district and large population of college-educated adults provide an environment conducive to academic success. Many people own their own single-family homes, providing areas for children to play and stability in the community. Finally, Lake St. Louis’s overall crime rate is lower than average for the country.

As is often the case in a small city, Lake St. Louis doesn't have a public transportation system that people use for their commute.

The education level of Lake St. Louis ranks among the highest in the nation. Of the 25-and-older adult population in Lake St. Louis, 49.71% 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 Lake St. Louis in 2022 was $57,945, which is wealthy relative to Missouri and the nation. This equates to an annual income of $231,780 for a family of four.

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

The most common language spoken in Lake St. Louis is English. Other important languages spoken here include Spanish and Other Asian languages.