Waltham is a city located in Massachusetts. With a 2020 population of 62,359, it is the 16th largest city in Massachusetts and the 612th largest city in the United States. Waltham is currently declining at a rate of -0.11% annually but its population has increased by 2.85% since the most recent census, which recorded a population of 60,632 in 2010. Waltham reached it's highest population of 63,114 in 2014. Spanning over 14 miles, Waltham has a population density of 4,893 people per square mile.
The average household income in Waltham is $115,461 with a poverty rate of 9.31%. The median rental costs in recent years comes to $1,726 per month, and the median house value is $536,500. The median age in Waltham is 34.3 years, 34.1 years for males, and 34.5 years for females. For every 100 females there are 95.4 males.