Union is a somewhat small city located in the state of South Carolina. With a population of 7,939 people and six associated neighborhoods, Union is the 58th largest community in South Carolina.

The percentage of adults in Union who are college-educated is close to the national average for all communities of 21.84%: 17.65% of the adults in Union have a bachelor's degree or advanced degree.

The per capita income in Union in 2022 was $25,672, which is middle income relative to South Carolina, and lower middle income relative to the rest of the US. This equates to an annual income of $102,688 for a family of four. However, Union contains both very wealthy and poor people as well.

Union is an extremely 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 English, Irish, German, Italian, and French.

The most common language spoken in Union is English. Other important languages spoken here include Spanish and Italian.