
Waltham
- County:
- Mower County
- County Seat:
- No
- Area (mi²):
- 0.478
- State:
- Minnesota
Waltham is a city located in Mower County, Minnesota. Waltham has a 2025 population of 164. Waltham is currently declining at a rate of 0% annually and its population has increased by 0.61% since the most recent census, which recorded a population of 163 in 2020.
The average household income in Waltham is $66,621 with a poverty rate of 11.35%. The median age in Waltham is 30.8 years: 34.2 years for males, and 30.6 years for females.