Sullivan is a very small city located in the state of Indiana. With a population of 4,223 people and two associated neighborhoods, Sullivan is the 144th largest community in Indiana. Sullivan has an unusually large stock of pre-World War II architecture, making it one of the older and more historic cities.

As is often the case in a small city, Sullivan doesn't have a public transportation system that people use for their commute.

The rate of college-level education in Sullivan is quite a bit lower than the national average among all cities of 21.84%: just 10.42% of people here over 25 have a bachelor's degree or an advanced degree.

The per capita income in Sullivan in 2022 was $20,583, which is low income relative to Indiana and the nation. This equates to an annual income of $82,332 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 Irish, English, German, Italian, and Scottish.

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