South Beloit is a city located in Winnebago County Illinois. With a 2020 population of 7,564, it is the 266th largest city in Illinois and the 3756th largest city in the United States . South Beloit is currently declining at a rate of -0.40% annually and its population has decreased by -4.16% since the most recent census, which recorded a population of 7,892 in 2010. South Beloit reached it's highest population of 7,901 in 2010. Spanning over 6 miles, South Beloit has a population density of 1,263 people per square mile.
The average household income in South Beloit is $66,424 with a poverty rate of 11.05%. The median rental costs in recent years comes to $784 per month, and the median house value is $125,800. The median age in South Beloit is 35 years, 33.9 years for males, and 35.2 years for females.