- Land Surveyor, Port Clinton - Land Surveying Services
- Landscape Contractors & Designers, Port Clinton
- Landscaping, Port Clinton
- Laundry Equipment Rental & Leasing, Port Clinton
- Laundry Self Service, Port Clinton
- Lawn & Garden Equipment & Supplies, Port Clinton
- Lawn & Garden Services, Port Clinton
- Lawn Maintenance Services, Port Clinton
- Lawn Mowers & Power Equipment, Port Clinton
- Lawyers & Attorneys, Port Clinton
- Legal Professionals, Port Clinton
- Libraries, Port Clinton
- License Services, Port Clinton
- Life Insurance, Port Clinton
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- Liquid Transportation - Non Hazardous, Port Clinton
- Liquor Stores, Port Clinton
- Live Theaters, Port Clinton
- Loans Personal, Port Clinton
- Locks, Port Clinton
- Locksmiths, Port Clinton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Port Clinton
- Lodging, Port Clinton
- Lodging Services, Port Clinton
- Long Haul Trucking Companies, Port Clinton
- Lottery Game Retailers, Port Clinton
- Lumber & Lumber Products, Port Clinton
- Lumber & Lumber Products, Port Clinton
- Lutheran Church, Port Clinton
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