
Altamont
- County:
- Effingham County
- County Seat:
- No
- Area (mi²):
- 1.537
- State:
- Illinois
Altamont is a city located in Effingham County, Illinois. Altamont has a 2025 population of 2,168. Altamont is currently declining at a rate of -0.46% annually and its population has decreased by -2.21% since the most recent census, which recorded a population of 2,217 in 2020.
The average household income in Altamont is $81,064 with a poverty rate of 14.2%. The median age in Altamont is 38 years: 35.1 years for males, and 41.4 years for females.