Union is a medium-sized city located in the state of Missouri. With a population of 13,198 people and four associated neighborhoods, Union is the 68th largest community in Missouri. There's nothing like the smell of a brand new house, and in Union, you'll find that a large proportion of houses were recently built. New growth in residential real estate is an indication that people are choosing to move to Union, and putting down their money on brand new construction. Union’s real estate is, on average, some of the newest in the nation. Union does seem to be experiencing an influx of affluent people, because the median household income is $73,435.00.

One interesting thing about the economy is that relatively large numbers of people worked from their home: 8.98% of the workforce. While this number may seem small overall, as a fraction of the total workforce this is high compared to the rest of the county. 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 citizens of Union are slightly better educated than the national average of 21.84% for all cities and towns, with 23.72% of adults in Union having a bachelor's degree or advanced degree.

The per capita income in Union in 2022 was $33,416, 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 $133,664 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.