
South Jacksonville
- County:
- Morgan County
- County Seat:
- No
- Area (mi²):
- 2.263
- State:
- Illinois
South Jacksonville is a village located in Morgan County, Illinois. South Jacksonville has a 2025 population of 3,159. South Jacksonville is currently declining at a rate of -0.85% annually and its population has decreased by -4.07% since the most recent census, which recorded a population of 3,293 in 2020.
The average household income in South Jacksonville is $65,701 with a poverty rate of 8.93%. The median age in South Jacksonville is 48.3 years: 43.8 years for males, and 51.3 years for females.