
Harrisburg
- County:
- Saline County
- County Seat:
- Yes
- Area (mi²):
- 6.612
- State:
- Illinois
Harrisburg is a city located in Saline County, Illinois. Harrisburg has a 2025 population of 7,713. It is also the county seat of Saline County. Harrisburg is currently declining at a rate of -1.24% annually and its population has decreased by -5.9% since the most recent census, which recorded a population of 8,197 in 2020.
The average household income in Harrisburg is $62,908 with a poverty rate of 25.13%. The median age in Harrisburg is 37.5 years: 36.1 years for males, and 42.6 years for females.