Mills township is located in Bond County, Illinois. Mills township has a 2026 population of 465. Mills township is currently declining at a rate of -0.21% annually and its population has decreased by -1.9% since the most recent census, which recorded a population of 474 in 2020.
The median age in Mills township is 58 years: 59.6 years for males, and 57.1 years for females. For every 100 females there are 97.6 males.