- Labels & Tags, Waltham
- Labor & Employment Consultants, Waltham
- Labor Organizations, Waltham
- Labor Unions, Waltham
- Laboratories Dental, Waltham
- Laboratories Medical, Waltham
- Laboratory Equipment Repair & Service, Waltham
- Lamp Shades, Waltham
- Lamps & Lamp Shades Retail, Waltham - Desk, Table & Floor Lamps
- Land Companies, Waltham
- Landscape Contractors & Designers, Waltham
- Landscape Design & Installation, Waltham
- Landscaping, Waltham
- Landscaping Materials & Supplies, Waltham
- Laser Equipment Repair & Service, Waltham
- Laser Printers, Waltham - Office Supplies
- Late Night Restaurants, Waltham
- Latin American Restaurants, Waltham
- Laundry & Dry Cleaning Equipment & Supplies, Waltham - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Waltham
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Waltham
- Lawn & Garden Equipment & Supplies, Waltham
- Lawn & Garden Services, Waltham
- Lawn & Garden Sprinkler Systems, Waltham
- Lawn Maintenance Services, Waltham
- Lawyers & Attorneys, Waltham
- Lead Inspection, Testing & Consulting, Waltham - Lead Paint
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- Leather Goods Cleaners & Dyers, Waltham
- Legal & Tax Services, Waltham
- Legal Professionals, Waltham
- Lending Services, Waltham
- Letter Signs, Waltham
- Licensed Counselors, Waltham
- Life Insurance, Waltham
- Lighting Fixtures Supplies & Parts Manufacturers, Waltham
- Limousine Service, Waltham
- Lingerie & Underwear for Women, Waltham - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Waltham
- Liquor Stores, Waltham
- Live Theaters, Waltham
- Livestock, Waltham
- Loans Personal, Waltham
- Local & Short Haul Trucking Companies, Waltham
- Locks, Waltham
- Locksmiths, Waltham - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Waltham
- Lodging, Waltham
- Lodging Services, Waltham
- Logistics Freight, Waltham
- Long Haul Trucking Companies, Waltham
- Luggage & Accessories , Waltham
- Lumber & Lumber Products, Waltham
- Lumber & Lumber Products, Waltham
- Lutheran Church, Waltham
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