
Posen
- County:
- Cook County
- County Seat:
- No
- Area (mi²):
- 1.169
- State:
- Illinois
Posen is a village located in Cook County, Illinois. Posen has a 2025 population of 5,176. Posen is currently declining at a rate of -1.5% annually and its population has decreased by -7.07% since the most recent census, which recorded a population of 5,570 in 2020.
The average household income in Posen is $83,024 with a poverty rate of 5.72%. The median age in Posen is 33 years: 30.3 years for males, and 37.7 years for females.