Waltham Flag

Waltham

County Seat:
No
Area (mi²):
12.745
State:
Massachusetts

Waltham is a city located in Middlesex County, Massachusetts. Waltham has a 2026 population of 65,849. Waltham is currently growing at a rate of 1.05% annually and its population has increased by 2.51% since the most recent census, which recorded a population of 64,238 in 2020.

65.8K
Total Population
5,167
Density (mi²)
684 1.05%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)