Waltham is a city located in Mower County Minnesota. With a 2020 population of 146, it is the 705th largest city in Minnesota and the 17522nd largest city in the United States . Waltham is currently declining at a rate of -1.35% annually and its population has decreased by -3.31% since the most recent census, which recorded a population of 151 in 2010. Waltham reached it's highest population of 152 in 2011. Spanning over 0 miles, Waltham has a population density of 305 people per square mile.
The average household income in Waltham is $100,045 with a poverty rate of 14.57%. The median rental costs in recent years comes to - per month, and the median house value is $77,900. The median age in Waltham is 36.1 years, 34.2 years for males, and 38.4 years for females.