
Union township
- County:
- McHenry County
- County Seat:
- No
- Area (mi²):
- 35.234
- State:
- Illinois
Union township is located in McHenry County, Illinois. Union township has a 2025 population of 196. Union township is currently declining at a rate of -1.01% annually and its population has decreased by -3.92% since the most recent census, which recorded a population of 204 in 2020.
The average household income in Union township is $128,452 with a poverty rate of 20.86%. The median age in Union township is 57 years: 59.2 years for males, and 51.1 years for females.