Sullivan is a somewhat small city located in the state of Missouri. With a population of 6,858 people and two associated neighborhoods, Sullivan is the 108th largest community in Missouri.

Sullivan is a small city, and as such doesn't have a public transit system that people use to get to and from their jobs every day.

The education level of Sullivan citizens, measured as those with bachelor's degrees or advanced degrees, is similar to the national average for all American cities and towns. 19.83% of adults 25 and older in Sullivan have a college degree.

The per capita income in Sullivan in 2018 was $31,068, 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 $124,272 for a family of four. However, Sullivan contains both very wealthy and poor people as well.

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

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