Nilwood
- County:
- Macoupin County
- County Seat:
- No
- Area (mi²):
- 0.465
- State:
- Illinois
Nilwood is a town located in Macoupin County, Illinois. Nilwood has a 2026 population of 196. Nilwood is currently declining at a rate of -1.01% annually and its population has decreased by -2% since the most recent census, which recorded a population of 200 in 2020.
The median household income in Nilwood is $46,771 with a poverty rate of 15.23%. The median age in Nilwood is 56.5 years: 43.5 years for males, and 58.8 years for females. For every 100 females there are 84.1 males.