- Laboratories Dental, South Dartmouth
- Laboratories Medical, South Dartmouth
- Land Surveyor, South Dartmouth - Land Surveying Services
- Landscape Contractors & Designers, South Dartmouth
- Landscaping, South Dartmouth
- Landscaping Materials & Supplies, South Dartmouth
- Lawn & Garden Equipment & Supplies, South Dartmouth
- Lawn & Garden Services, South Dartmouth
- Lawn & Garden Sprinkler Systems, South Dartmouth
- Lawn Maintenance Services, South Dartmouth
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- Lawyers & Attorneys, South Dartmouth
- Leather Goods Cleaners & Dyers, South Dartmouth
- Legal Professionals, South Dartmouth
- Liquor Stores, South Dartmouth
- Livestock, South Dartmouth
- Locks, South Dartmouth
- Locksmiths, South Dartmouth - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South Dartmouth
- Lodging, South Dartmouth
- Long Haul Trucking Companies, South Dartmouth
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