- Labor Organizations, Port Colborne
- Laboratories Dental, Port Colborne
- Laboratories Medical, Port Colborne
- Land Companies, Port Colborne
- Land Surveyor, Port Colborne - Land Surveying Services
- Landscape Contractors & Designers, Port Colborne
- Landscaping, Port Colborne
- Laundromats & Dry-Cleaning, Coin-Operated, Port Colborne
- Lawn & Garden Services, Port Colborne
- Lawn Maintenance Services, Port Colborne
- Lawyers & Attorneys, Port Colborne
- Legal Professionals, Port Colborne
- License & Registry Services, Port Colborne
- License Bureaus Motor Vehicles, Port Colborne
- Life Insurance, Port Colborne
- Lime & Limestone, Port Colborne
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- Linen Supply Services, Port Colborne
- Lingerie & Underwear for Women, Port Colborne - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Port Colborne
- Loans Personal, Port Colborne
- Locks, Port Colborne
- Locksmiths, Port Colborne - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Port Colborne
- Lodging, Port Colborne
- Lodging Services, Port Colborne
- Long Haul Trucking Companies, Port Colborne
- Lumber & Lumber Products, Port Colborne
- Lumber & Lumber Products, Port Colborne
- Lumber & Wood Products Manufacturers, Port Colborne
- Lumber Companies, Port Colborne - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Port Colborne
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