- Labels & Tags, Seaford
- Labor Organizations, Seaford
- Laboratories Medical, Seaford
- Land Surveyor, Seaford - Land Surveying Services
- Landscape Contractors & Designers, Seaford
- Landscape Design & Installation, Seaford
- Landscape Garden Services, Seaford
- Landscaping, Seaford
- Landscaping Materials & Supplies, Seaford
- Laundry Self Service, Seaford
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Seaford
- Lawn & Garden Services, Seaford
- Lawn Maintenance Services, Seaford
- Lawyers & Attorneys, Seaford
- Legal & Tax Services, Seaford
- Legal Professionals, Seaford
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- Libraries, Seaford
- Life Insurance, Seaford
- Lighting Fixtures & Equipment, Seaford
- Lime & Limestone, Seaford
- Linen Supply Services, Seaford
- Liquid Transportation - Non Hazardous, Seaford
- Liquor Stores, Seaford
- Livestock, Seaford
- Loans Personal, Seaford
- Loans Title Services, Seaford
- Lodging, Seaford
- Lodging Services, Seaford
- Long Haul Trucking Companies, Seaford
- Long Term Care Facility, Seaford
- Lumber & Lumber Products, Seaford
- Lutheran Church, Seaford
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