South Jacksonville is a city located in Illinois. With a 2020 population of 3,016, it is the 415th largest city in Illinois and the 6243rd largest city in the United States . South Jacksonville is currently declining at a rate of -1.41% annually and its population has decreased by -9.46% since the most recent census, which recorded a population of 3,331 in 2010. South Jacksonville reached it's highest population of 3,475 in 2000. Spanning over 2 miles, South Jacksonville has a population density of 1,327 people per square mile.
The average household income in South Jacksonville is $61,426 with a poverty rate of 12.56%. The median rental costs in recent years comes to $725 per month, and the median house value is $111,400. The median age in South Jacksonville is 47.1 years, 48.9 years for males, and 43.2 years for females.