Union township
- County:
- McHenry County
- County Seat:
- No
- Area (mi²):
- 35.792
- State:
- Illinois
Union township is located in McHenry County, Illinois. Union township has a 2026 population of 766. Union township is currently growing at a rate of 0.13% annually but its population has decreased by -1.03% since the most recent census, which recorded a population of 774 in 2020.
The median household income in Union township is $84,000 with a poverty rate of 0.84%. The median age in Union township is 34.9 years: 36.9 years for males, and 30.5 years for females. For every 100 females there are 112.1 males.