Deerfield township
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 34.173
- State:
- Illinois
Deerfield township is located in Lake County, Illinois. Deerfield township has a 2026 population of 243. Deerfield township is currently declining at a rate of 0% annually and its population has decreased by -2.02% since the most recent census, which recorded a population of 248 in 2020.
The median age in Deerfield township is 54.5 years: 54.4 years for males, and 54.6 years for females. For every 100 females there are 160.0 males.