- Warehousing & Storage, Billerica - Warehouse Services
- Washing Compounds, Billerica
- Waste & Refuse Services & Sites, Billerica
- Waste Container Rental, Billerica
- Weapons Guns & Knives, Billerica
- Wedding & Bridal Services, Billerica
- Wedding Supplies & Bridal Shops, Billerica
- Weight Loss & Control Programs, Billerica
- Welding & Welder, Billerica - Welding Supplies, Machines, Equipment, Services & Contractors
- Wildlife Rescue & Rehabilitation, Billerica
- Wildlife Services, Billerica
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- Window Tinting & Coating, Billerica
- Window Tinting & Glass Coating - Security & Protective, Billerica
- Windows, Billerica - Single & Double Hung, Casement, Sliding, Glass Block, Basement Windows & More
- Windows and Doors, Billerica - Wholesale, Manufacturers & Suppliers
- Wire Conduit & Cable, Billerica
- Wire, Cable & Rope, Billerica
- Wireless & Cellular Communications Equipment & Supplies, Billerica
- Woodworking Contractors, Billerica - Carpentry Contractors
- Woodworking Tools, Supplies, Machinery & Equipment , Billerica
- Wrecking & Demolition Contractors, Billerica - House & Building Demolition Companies
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