
South Beloit
- County:
- Winnebago County
- County Seat:
- No
- Area (mi²):
- 6.144
- State:
- Illinois
South Beloit is a city located in Winnebago County, Illinois. South Beloit has a 2025 population of 7,838. South Beloit is currently declining at a rate of -0.34% annually and its population has decreased by -1.72% since the most recent census, which recorded a population of 7,975 in 2020.
The average household income in South Beloit is $90,064 with a poverty rate of 8.61%. The median age in South Beloit is 35.7 years: 36.3 years for males, and 35 years for females.