
Alder
- County:
- Madison County
- County Seat:
- No
- Area (mi²):
- 2.007
- State:
- Montana
Alder is a CDP located in Madison County, Montana. Alder has a 2025 population of 109. Alder is currently declining at a rate of 0% annually and its population has increased by 17.2% since the most recent census, which recorded a population of 93 in 2020.
The average household income in Alder is $49,359 with a poverty rate of 13.89%. The median age in Alder is 58 years: 56.9 years for males, and 61.8 years for females.