Chalmers township is located in McDonough County, Illinois. Chalmers township has a 2026 population of 682. Chalmers township is currently declining at a rate of -1.02% annually and its population has decreased by -3.67% since the most recent census, which recorded a population of 708 in 2020.
The median age in Chalmers township is 62 years: 65.2 years for males, and 59.5 years for females. For every 100 females there are 94.9 males.
Data after 2023 is projected based on recent change
Overall: 62 years
Female: 59.5 years
Male: 65.2 years
There are 473 adults, (205 of whom are seniors) in Chalmers township.
Female: 273 (51.3%)
Male: 259 (48.7%)
The racial composition of Chalmers township includes 88.35% White, 3.38% Asian, and smaller percentages for other race and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 470 | 88.35% |
| Two or more races | 41 | 7.71% |
| Asian | 18 | 3.38% |
| Other race | 3 | 0.56% |