Princeton is a somewhat small city located in the state of Illinois. With a population of 7,667 people and three associated neighborhoods, Princeton is the 265th largest community in Illinois.

The percentage of people in Princeton who are college-educated is somewhat higher than the average US community of 21.84%: 26.30% of adults in Princeton have at least a bachelor's degree.

The per capita income in Princeton in 2022 was $36,717, which is middle income relative to Illinois and the nation. This equates to an annual income of $146,868 for a family of four. However, Princeton contains both very wealthy and poor people as well.

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

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