Haines township
- County:
- Marion County
- County Seat:
- No
- Area (mi²):
- 36.064
- State:
- Illinois
Haines township is located in Marion County, Illinois. Haines township has a 2026 population of 842. Haines township is currently declining at a rate of -0.36% annually and its population has decreased by -2.88% since the most recent census, which recorded a population of 867 in 2020.
The median household income in Haines township is $73,580 with a poverty rate of 9.3%. The median age in Haines township is 28.7 years: 33.2 years for males, and 26.8 years for females. For every 100 females there are 93.7 males.