Nason
- County:
- Jefferson County
- County Seat:
- No
- Area (mi²):
- 0.911
- State:
- Illinois
Nason is a city located in Jefferson County, Illinois. Nason has a 2026 population of 196. Nason is currently declining at a rate of -0.51% annually and its population has decreased by -1.51% since the most recent census, which recorded a population of 199 in 2020.
The median household income in Nason is $50,052 with a poverty rate of 29.7%. The median age in Nason is 36.5 years: 33 years for males, and 42.4 years for females. For every 100 females there are 101.0 males.