Billerica is a town located in Middlesex County, in the state of Massachusetts (MA), United States. Nestled in the New England division of the North-east region, it covers an area of 25.9 square miles (67.0 km²) and sits at an elevation of 250 ft. With a population of approximately 38,981 residents, Billerica offers a vibrant community life.
The town's population is composed of about 50.85% males and 49.15% females, and it has a population density of 505.06 people per square mile (581.11/km²). Billerica lies at a latitude of 42.55 and a longitude of -71.26, operating in the UTC-5.
Locals reflect a blend of American ancestry, with roots primarily in United States (0%), followed by English (13.4%), German (6%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 01821.