Decatur is a somewhat small city located in the state of Indiana. With a population of 9,990 people and four associated neighborhoods, Decatur is the 84th largest community in Indiana.

Being a small city, Decatur does not have a public transit system used by locals to get to and from work.

In Decatur, just 12.74% of people have at least a bachelor's degree, which is quite a bit lower than the national average for cities and towns of 21.84%.

The per capita income in Decatur in 2018 was $27,086, which is lower middle income relative to Indiana and the nation. This equates to an annual income of $108,344 for a family of four. However, Decatur contains both very wealthy and poor people as well.

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

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