Round Lake is a medium-sized village located in the state of Illinois. With a population of 18,491 people and three associated neighborhoods, Round Lake is the 135th largest community in Illinois. Round Lake has seen a significant amount of newer housing growth in recent years. Quite often, new home construction is the result of new residents moving in who are middle class or wealthier, attracted by jobs, a healthy local economy, or other amenities as they leave nearby or far away areas for greener pastures. This seems to be the case in Round Lake, where the median household income is $92,165.00.

Also of interest is that Round 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 Round Lake telecommute to their jobs. Overall, about 10.55% 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.

Round Lake’s overall crime rate ranks among the lowest in the nation, making it a very safe place to live.

One downside of living in Round Lake, however, is that residents on average have to contend with a long commute, spending on average 32.92 minutes every day commuting to work.

The citizens of Round Lake are very well educated compared to the average community in the nation: 39.46% of adults in Round Lake have a bachelor's degree or even advanced degree.

The per capita income in Round Lake in 2022 was $36,959, which is upper middle income relative to Illinois and the nation. This equates to an annual income of $147,836 for a family of four. However, Round Lake contains both very wealthy and poor people as well.

Round Lake is an extremely ethnically-diverse village. The people who call Round Lake home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Round Lake residents report their race to be White, followed by Asian. Round Lake also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 30.10% of the village’s residents. Important ancestries of people in Round Lake include German, Polish, Irish, Italian, and English.

Foreign born people are also an important part of Round Lake's cultural character, accounting for 27.64% of the village’s population.

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