- Laboratories Dental, Stony Brook
- Laboratories Medical, Stony Brook
- Landscape Contractors & Designers, Stony Brook
- Landscaping, Stony Brook
- Laser Hair Removal, Stony Brook
- Late Night Restaurants, Stony Brook
- Lawn & Garden Equipment & Supplies, Stony Brook
- Lawn & Garden Services, Stony Brook
- Lawn & Garden Sprinkler Systems, Stony Brook
- Lawn & Garden Supplies & Equipment, Stony Brook
- Lawn Maintenance Services, Stony Brook
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- Lawyers & Attorneys, Stony Brook
- Legal & Tax Services, Stony Brook
- Legal Professionals, Stony Brook
- Lighting Fixtures & Equipment, Stony Brook
- Limousine Service, Stony Brook
- Liquor Stores, Stony Brook
- Literary Agents, Stony Brook
- Locksmiths, Stony Brook - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Stony Brook
- Long Haul Trucking Companies, Stony Brook
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