- Laboratories Dental, Stoneham
- Laboratories Medical, Stoneham
- Land Surveyor, Stoneham - Land Surveying Services
- Landscape Contractors & Designers, Stoneham
- Landscaping, Stoneham
- Language Schools, Stoneham
- Laser Printers, Stoneham - Office Supplies
- Laundry Self Service, Stoneham
- Lawn & Garden Equipment & Supplies, Stoneham
- Lawn & Garden Sprinkler Systems, Stoneham
- Lawn Mower Repair & Blade Sharpening Service, Stoneham
- Lawyers & Attorneys, Stoneham
- Lead Paint Testing, Detection & Removal, Stoneham
- Leather Finishers, Stoneham
- Leather Goods, Stoneham
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- Leather Tanning & Finishing Manufacturers, Stoneham
- Legal & Tax Services, Stoneham
- Legal Information & Referral Services, Stoneham
- Legal Professionals, Stoneham
- Licensed Counselors, Stoneham
- Limousine Service, Stoneham
- Liquor Stores, Stoneham
- Litigation Support Services, Stoneham
- Locks, Stoneham
- Locksmiths, Stoneham - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Stoneham
- Lodging, Stoneham
- Long Haul Trucking Companies, Stoneham
- Luggage & Accessories , Stoneham
- Luggage Wholesale, Stoneham
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