
Belknap
- County:
- Johnson County
- County Seat:
- No
- Area (mi²):
- 1.057
- State:
- Illinois
Belknap is a village located in Johnson County, Illinois. Belknap has a 2025 population of 85. Belknap is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 85 in 2020.
The average household income in Belknap is $71,489 with a poverty rate of 7.69%. The median age in Belknap is 54.3 years: 54.2 years for males, and 56.1 years for females.