- Labor Organizations, South Dennis
- Laboratories Dental, South Dennis
- Laboratories Medical, South Dennis
- Land Surveyor, South Dennis - Land Surveying Services
- Landscape Contractors & Designers, South Dennis
- Landscape Lighting, South Dennis
- Landscaping, South Dennis
- Landscaping Materials & Supplies, South Dennis
- Lawn & Garden Equipment & Supplies, South Dennis
- Lawn & Garden Services, South Dennis
- Lawn & Garden Sprinkler Systems, South Dennis
- Lawn & Tree Service, South Dennis
- Lawn Maintenance Services, South Dennis
- Lawn Mowers & Power Equipment, South Dennis
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- Lawyers & Attorneys, South Dennis
- Legal & Tax Services, South Dennis
- Legal Professionals, South Dennis
- Libraries, South Dennis
- Lighting Fixtures & Equipment, South Dennis
- Limousine Service, South Dennis
- Liquor & Beer Manufacturers, South Dennis
- Liquor Stores, South Dennis
- Livestock, South Dennis
- Locks, South Dennis
- Locksmiths, South Dennis - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South Dennis
- Lodging, South Dennis
- Long Haul Trucking Companies, South Dennis
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