
Flagg township
- County:
- Ogle County
- County Seat:
- No
- Area (mi²):
- 35.552
- State:
- Illinois
Flagg township is located in Ogle County, Illinois. Flagg township has a 2025 population of 13,112. Flagg township is currently declining at a rate of -0.21% annually and its population has decreased by -1.44% since the most recent census, which recorded a population of 13,303 in 2020.
The average household income in Flagg township is $83,078 with a poverty rate of 9.03%. The median age in Flagg township is 37.3 years: 36.5 years for males, and 39.8 years for females.