
New Boston
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 0.941
- State:
- Illinois
New Boston is a city located in Mercer County, Illinois. New Boston has a 2025 population of 610. New Boston is currently declining at a rate of 0% annually and its population has decreased by -0.33% since the most recent census, which recorded a population of 612 in 2020.
The average household income in New Boston is $70,302 with a poverty rate of 13.45%. The median age in New Boston is 42 years: 48.4 years for males, and 37.3 years for females.