South Beloit is a somewhat small city located in the state of Illinois. With a population of 7,908 people and two associated neighborhoods, South Beloit is the 262nd largest community in Illinois.

The overall education level of South Beloit is somewhat higher than in the average US city of 21.84%: 25.04% of adults 25 and older in the city have at least a bachelor's degree.

The per capita income in South Beloit in 2022 was $35,108, which is middle income relative to Illinois and the nation. This equates to an annual income of $140,432 for a family of four. However, South Beloit contains both very wealthy and poor people as well.

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

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