Jefferson township
- County:
- Stephenson County
- County Seat:
- No
- Area (mi²):
- 18.163
- State:
- Illinois
Jefferson township is located in Stephenson County, Illinois. Jefferson township has a 2026 population of 241. Jefferson township is currently declining at a rate of -0.41% annually and its population has decreased by -2.82% since the most recent census, which recorded a population of 248 in 2020.
The median household income in Jefferson township is $76,250 with a poverty rate of 5.73%. The median age in Jefferson township is 47.1 years: 47.2 years for males, and 40.8 years for females. For every 100 females there are 130.9 males.