- Labor & Employment Consultants, Medford
- Labor Organizations, Medford
- Laboratories Dental, Medford
- Laboratories Medical, Medford
- Lacrosse Equipment & Supplies, Medford
- Land Surveyor, Medford - Land Surveying Services
- Landscape Contractors & Designers, Medford
- Landscaping, Medford
- Landscaping Materials & Supplies, Medford
- Language Schools, Medford
- Late Night Restaurants, Medford
- Laundromats & Dry-Cleaning, Coin-Operated, Medford
- Laundry & Dry Cleaning Equipment & Supplies, Medford - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Leasing, Sales & Service, Medford
- Laundry Self Service, Medford
- Lawn & Garden Equipment & Supplies, Medford
- Lawn & Garden Sprinkler Systems, Medford
- Lawn & Garden Supplies & Equipment, Medford
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- Lawyers & Attorneys, Medford
- Legal & Tax Services, Medford
- Legal Professionals, Medford
- Libraries, Medford
- Lighting Fixtures & Equipment, Medford
- Limousine Service, Medford
- Linen Supply Services, Medford
- Liquor Stores, Medford
- Litigation / Trial Attorneys & Lawyers, Medford
- Loans Personal, Medford
- Locks, Medford
- Locksmiths, Medford - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Medford
- Lodging, Medford
- Long Haul Trucking Companies, Medford
- Lubricating Oils , Medford - Motor Oil
- Luggage & Accessories , Medford
- Lumber & Lumber Products, Medford
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