Union is a medium-sized city located in the state of Missouri. With a population of 13,000 people and four associated neighborhoods, Union is the 68th largest community in Missouri. Much of the housing stock in Union was built relatively recently. The construction of new real estate can often be taken as an indication that the local Union economy is robust, and that jobs or other amenities are attracting an influx of new residents. This seems to be the case in Union, where the median household income is $71,760.00.

Also of interest is that Union 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 Union telecommute to their jobs. Overall, about 9.00% 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 percentage of people in Union who are college-educated is somewhat higher than the average US community of 21.84%: 25.62% of adults in Union have at least a bachelor's degree.

The per capita income in Union in 2022 was $33,008, which is upper middle income relative to Missouri, and middle income relative to the rest of the US. This equates to an annual income of $132,032 for a family of four. However, Union contains both very wealthy and poor people as well.

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

The most common language spoken in Union is English. Other important languages spoken here include Polish and Other Indo-European.