Mountain Iron
- County:
- St. Louis County
- County Seat:
- No
- Area (mi²):
- 68.107
- State:
- Minnesota
Mountain Iron is a city located in St. Louis County, Minnesota. Mountain Iron has a 2026 population of 2,847. Mountain Iron is currently declining at a rate of -0.38% annually and its population has decreased by -0.73% since the most recent census, which recorded a population of 2,868 in 2020.