Wilmington is a somewhat small city located in the state of Illinois. With a population of 5,578 people and five associated neighborhoods, Wilmington is the 317th largest community in Illinois.

The percentage of adults in Wilmington who are college-educated is close to the national average for all communities of 21.84%: 19.61% of the adults in Wilmington have a bachelor's degree or advanced degree.

The per capita income in Wilmington in 2022 was $36,538, which is upper middle income relative to Illinois and the nation. This equates to an annual income of $146,152 for a family of four. However, Wilmington contains both very wealthy and poor people as well.

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

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