- Labor Organizations, Southport
- Laboratories Medical, Southport
- Land Surveyor, Southport - Land Surveying Services
- Landscape Contractors & Designers, Southport
- Landscaping, Southport
- Late Night Restaurants, Southport
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Southport
- Lawn & Garden Services, Southport
- Lawn Maintenance Services, Southport
- Lawyers & Attorneys, Southport
- Legal Professionals, Southport
- License Services, Southport
- Licensed Counselors, Southport
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- Lighting Fixtures & Equipment, Southport
- Linens, Southport
- Liquor Stores, Southport
- Livestock, Southport
- Livestock Equipment & Supplies, Southport
- Livestock Feeders, Southport
- Locks, Southport
- Locksmiths, Southport - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Southport
- Lodging, Southport
- Long Haul Trucking Companies, Southport
- Lumber & Lumber Products, Southport
- Lutheran Church, Southport
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