Buy a Local Phone Number – Area Code 339 (Waltham, Massachusetts)

Serving Waltham and Boston’s western inner suburbs, area code 339 was introduced in 2001 as an overlay to 781 to relieve number exhaustion after the 1997 split from 617. The overlay brought mandatory 10-digit dialing and tracked rapid growth along the Route 128/I‑95 corridor. Waltham’s position as a regional employment hub—bridging historic factory districts and modern office parks—made it central to the numbering change and to the suburban technology belt that matured around it.

• Technology and software: enterprise applications, cybersecurity, and SaaS firms along Route 128
• Life sciences and medical devices: R&D labs, biotech startups, and clinical services
• Higher education and research: partnerships anchored by Brandeis University and Bentley University
• Defense, robotics, and advanced manufacturing: precision engineering with university and federal ties
• Professional services and capital: consultancies, finance, and venture investment supporting growth companies

Historically nicknamed “Watch City” for the Waltham Watch Company, the community helped pioneer precision mass production that seeded later electronics and instrumentation across suburban Boston. Mill buildings along the Charles River now host startups, design firms, and the Charles River Museum of Industry & Innovation, linking 19th‑century engineering to today’s innovation culture. Diverse immigrant communities and restaurant corridors such as Moody Street add a cosmopolitan layer, while commuter rail and interstate access connect residents and employers to the broader metropolitan economy.