- Labor & Employment Consultants, Somerville
- Labor Organizations, Somerville
- Labor Relations Counselors, Somerville
- Laboratories Allergy, Somerville
- Laboratories Medical, Somerville
- Laboratory Equipment Repair & Service, Somerville
- Ladder & Lift Equipment & Machine Rental, Somerville
- Land Surveyor, Somerville - Land Surveying Services
- Landscape Contractors & Designers, Somerville
- Landscaping, Somerville
- Language Schools, Somerville
- Laser Equipment Repair & Service, Somerville
- Late Night Restaurants, Somerville
- Laundromats & Dry-Cleaning, Coin-Operated, Somerville
- Laundry & Dry Cleaning Equipment & Supplies, Somerville - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Somerville
- Lawn & Garden Equipment & Supplies, Somerville
- Lawn & Garden Services, Somerville
- Lawn & Garden Sprinkler Systems, Somerville
- Lawn & Garden Supplies & Equipment, Somerville
- Lawn Maintenance Services, Somerville
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- Lawn Mowers & Power Equipment, Somerville
- Lawyers & Attorneys, Somerville
- Leather Goods Stores & Dealers, Somerville
- Legal & Tax Services, Somerville
- Legal Professionals, Somerville
- Libraries, Somerville
- Lighting Fixtures & Equipment, Somerville
- Limousine Service, Somerville
- Linens, Somerville
- Liquor & Beer Manufacturers, Somerville
- Liquor Stores, Somerville
- Loans Personal, Somerville
- Locks, Somerville
- Locksmiths, Somerville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Somerville
- Lodging, Somerville
- Lodging Services, Somerville
- Long Haul Trucking Companies, Somerville
- Luggage & Accessories , Somerville
- Lumber & Lumber Products, Somerville
- Lumber Companies, Somerville - Wholesale, Manufacturers & Suppliers
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