- Labor Organizations, Dorchester Center
- Laboratories Medical, Dorchester Center
- Laundry Self Service, Dorchester Center
- Lawn & Garden Equipment & Supplies, Dorchester Center
- Lawn & Garden Sprinkler Systems, Dorchester Center
- Lawn & Garden Supplies & Equipment, Dorchester Center
- Lawyers & Attorneys, Dorchester Center
- Legal & Tax Services, Dorchester Center
- Legal Professionals, Dorchester Center
- Licensed Counselors, Dorchester Center
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- Limousine Service, Dorchester Center
- Liquor & Beer Manufacturers, Dorchester Center
- Liquor Stores, Dorchester Center
- Locks, Dorchester Center
- Locksmiths, Dorchester Center - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Dorchester Center
- Lodging, Dorchester Center
- Long Haul Trucking Companies, Dorchester Center
- Lutheran Church, Dorchester Center
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