
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 2025 population of 614. Union township is currently declining at a rate of -0.81% annually and its population has decreased by -3.76% since the most recent census, which recorded a population of 638 in 2020.
The average household income in Union township is $128,970 with a poverty rate of 0%. The median age in Union township is 68.6 years: 69.4 years for males, and 67.2 years for females.