
Alto Pass
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 2.134
- State:
- Illinois
Alto Pass is a village located in Union County, Illinois. Alto Pass has a 2025 population of 298. Alto Pass is currently declining at a rate of -1% annually and its population has decreased by -4.79% since the most recent census, which recorded a population of 313 in 2020.
The average household income in Alto Pass is $72,387 with a poverty rate of 5.56%. The median age in Alto Pass is 45.2 years: 34.9 years for males, and 49.2 years for females.