- Laboratories Dental, Seaside
- Laboratories Medical, Seaside
- Land Surveyor, Seaside - Land Surveying Services
- Landscape Contractors & Designers, Seaside
- Landscape Garden Services, Seaside
- Landscaping, Seaside
- Landscaping Materials & Supplies, Seaside
- Late Night Restaurants, Seaside
- Lawn & Garden Decor & Ornaments, Seaside
- Lawn & Garden Equipment & Supplies, Seaside
- Lawn & Garden Services, Seaside
- Lawn & Garden Sprinkler Systems, Seaside
- Lawn Maintenance Services, Seaside
- Lawyers & Attorneys, Seaside
- Lead Inspection, Testing & Consulting, Seaside - Lead Paint
- Legal & Tax Services, Seaside
- Legal Professionals, Seaside
- Letter Signs, Seaside
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- Lexus Dealers, Seaside
- Libraries, Seaside
- License Services, Seaside
- Life Insurance, Seaside
- Lighting Fixtures Repair, Maintenance & Installation, Seaside
- Limousine Service, Seaside
- Liquor Stores, Seaside
- Loans Personal, Seaside
- Local & Short Haul Trucking Companies, Seaside
- Locks, Seaside
- Locksmiths, Seaside - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Seaside
- Lodging, Seaside
- Lodging Services, Seaside
- Long Haul Trucking Companies, Seaside
- Lumber & Lumber Products, Seaside
- Lutheran Church, Seaside
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