Dorchester
- County:
- Macoupin County
- County Seat:
- No
- Area (mi²):
- 0.722
- State:
- Illinois
Dorchester is a village located in Macoupin County, Illinois. Dorchester has a 2026 population of 125. Dorchester is currently declining at a rate of 0% annually and its population has decreased by -3.1% since the most recent census, which recorded a population of 129 in 2020.
The median household income in Dorchester is $127,500 with a poverty rate of 0.55%. The median age in Dorchester is 43.5 years: 55.3 years for males, and 37.5 years for females. For every 100 females there are 100.0 males.