
Monticello township
- County:
- Piatt County
- County Seat:
- No
- Area (mi²):
- 47.998
- State:
- Illinois
Monticello township is located in Piatt County, Illinois. Monticello township has a 2025 population of 6,239. Monticello township is currently growing at a rate of 0.56% annually and its population has increased by 2.23% since the most recent census, which recorded a population of 6,103 in 2020.
The average household income in Monticello township is $100,449 with a poverty rate of 5.83%. The median age in Monticello township is 44.9 years: 42.9 years for males, and 47.2 years for females.