Union township
- County:
- McHenry County
- County Seat:
- No
- Area (mi²):
- 52.729
- State:
- Illinois
Union township is located in McHenry County, Illinois. Union township has a 2026 population of 627. Union township is currently declining at a rate of 0% annually and its population has decreased by -1.72% since the most recent census, which recorded a population of 638 in 2020.
The median household income in Union township is $63,958 with a poverty rate of 0%. The median age in Union township is 68.4 years: 69.3 years for males, and 65.9 years for females. For every 100 females there are 117.6 males.