- Laboratories Dental, South Boston
- Laboratories Medical, South Boston
- Land Surveyor, South Boston - Land Surveying Services
- Landscape Contractors & Designers, South Boston
- Landscaping, South Boston
- Late Night Restaurants, South Boston
- Laundry Equipment Rental & Leasing, South Boston
- Law Enforcement Professional, South Boston
- Lawn & Garden Chemicals, Insecticides & Fertilizers, South Boston
- Lawn & Garden Equipment & Supplies, South Boston
- Lawn & Garden Services, South Boston
- Lawn Maintenance Services, South Boston
- Lawn Mowers & Power Equipment, South Boston
- Lawyers & Attorneys, South Boston
- Leather Goods, South Boston
- Leather Tanning & Finishing Manufacturers, South Boston
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- Legal Professionals, South Boston
- Life Insurance, South Boston
- Limousine Service, South Boston
- Loans Check Cashing, South Boston
- Loans Personal, South Boston
- Loans Title Services, South Boston
- Locks, South Boston
- Locksmiths, South Boston - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South Boston
- Lodging, South Boston
- Lodging Services, South Boston
- Loggers, South Boston
- Long Haul Trucking Companies, South Boston
- Lumber & Lumber Products, South Boston
- Lumber Companies, South Boston - Wholesale, Manufacturers & Suppliers
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