- Labor Organizations, Seaford
- Laboratories Dental, Seaford
- Laboratories Medical, Seaford
- Land Surveyor, Seaford - Land Surveying Services
- Landscape Contractors & Designers, Seaford
- Landscaping, Seaford
- Lawn & Garden Equipment & Supplies, Seaford
- Lawn & Garden Services, Seaford
- Lawn & Garden Sprinkler Systems, Seaford
- Lawn Maintenance Services, Seaford
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- Lawyers & Attorneys, Seaford
- Legal Professionals, Seaford
- Libraries, Seaford
- License Services, Seaford
- Licensed Counselors, Seaford
- Limousine Service, Seaford
- Liquor Stores, Seaford
- Locksmiths, Seaford - Residence, Commercial, Safe & Auto Car Locksmith
- Long Haul Trucking Companies, Seaford
- Lutheran Church, Seaford
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