
Billerica
- County:
- Middlesex County
- County Seat:
- No
- Area (mi²):
- 25.574
- State:
- Massachusetts
Billerica is located in Middlesex County, Massachusetts. Billerica has a 2025 population of 41,787. Billerica is currently growing at a rate of 0.2% annually but its population has decreased by -0.12% since the most recent census, which recorded a population of 41,836 in 2020.
The average household income in Billerica is $149,761 with a poverty rate of 4.47%. The median age in Billerica is 43.3 years: 42.4 years for males, and 43.9 years for females.