
Anna
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 3.693
- State:
- Illinois
Anna is a city located in Union County, Illinois. Anna has a 2025 population of 4,038. Anna is currently declining at a rate of -1.2% annually and its population has decreased by -5.7% since the most recent census, which recorded a population of 4,282 in 2020.
The average household income in Anna is $53,953 with a poverty rate of 31.06%. The median age in Anna is 39.6 years: 38.1 years for males, and 49.6 years for females.