- Labor & Employment Consultants, Seabrook
- Ladder & Ladder Accessories, Seabrook
- Land Development & Planning Engineer, Seabrook
- Landscape Contractors & Designers, Seabrook
- Landscaping, Seabrook
- Landscaping Materials & Supplies, Seabrook
- Late Night Restaurants, Seabrook
- Laundry Self Service, Seabrook
- Lawn & Garden Consultants, Seabrook
- Lawn & Garden Services, Seabrook
- Lawn Maintenance Services, Seabrook
- Lawyers & Attorneys, Seabrook
- Legal Professionals, Seabrook
- Libraries, Seabrook
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- Life Insurance, Seabrook
- Lighting Fixtures & Equipment, Seabrook
- Liquid & Bulk Storage, Seabrook
- Liquor Stores, Seabrook
- Livestock, Seabrook
- Loans Personal, Seabrook
- Locks, Seabrook
- Locksmiths, Seabrook - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Seabrook
- Lodging, Seabrook
- Lodging Services, Seabrook
- Logistics Freight, Seabrook
- Long Haul Trucking Companies, Seabrook
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