
Allen township
- County:
- LaSalle County
- County Seat:
- No
- Area (mi²):
- 36.226
- State:
- Illinois
Allen township is located in LaSalle County, Illinois. Allen township has a 2025 population of 504. Allen township is currently growing at a rate of 0.4% annually but its population has decreased by -0.4% since the most recent census, which recorded a population of 506 in 2020.
The average household income in Allen township is $102,545 with a poverty rate of 10.84%. The median age in Allen township is 44.1 years: 37.4 years for males, and 47.3 years for females.