Nilwood township
- County:
- Macoupin County
- County Seat:
- No
- Area (mi²):
- 36.461
- State:
- Illinois
Nilwood township is located in Macoupin County, Illinois. Nilwood township has a 2026 population of 566. Nilwood township is currently declining at a rate of -0.53% annually and its population has decreased by -2.08% since the most recent census, which recorded a population of 578 in 2020.
The median household income in Nilwood township is $66,250 with a poverty rate of 7.36%. The median age in Nilwood township is 48.2 years: 50.3 years for males, and 48.1 years for females. For every 100 females there are 107.9 males.