- Labor & Employment Consultants, Tiffin
- Laboratories Medical, Tiffin
- Laboratories Pathological, Tiffin
- Laminating Services, Tiffin
- Land Surveyor, Tiffin - Land Surveying Services
- Landscape Contractors & Designers, Tiffin
- Landscaping, Tiffin
- Laundromats & Dry-Cleaning, Coin-Operated, Tiffin
- Laundry Self Service, Tiffin
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Tiffin
- Lawn & Garden Equipment & Supplies, Tiffin
- Lawn & Garden Services, Tiffin
- Lawn Maintenance Services, Tiffin
- Lawn Mower Repair & Blade Sharpening Service, Tiffin
- Lawn Mowers & Power Equipment, Tiffin
- Lawyers & Attorneys, Tiffin
- Legal Professionals, Tiffin
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- Lennox Air Conditioning, Tiffin - Air Conditioner Contractors & Systems
- Libraries, Tiffin
- License Services, Tiffin
- Licensed Counselors, Tiffin
- Life Insurance, Tiffin
- Lighting Fixtures & Equipment, Tiffin
- Limousine Service, Tiffin
- Liquor Stores, Tiffin
- Live Theaters, Tiffin
- Loans Personal, Tiffin
- Local & Short Haul Trucking Companies, Tiffin
- Lodging, Tiffin
- Lodging Services, Tiffin
- Long Haul Trucking Companies, Tiffin
- Lottery Game Retailers, Tiffin
- Lumber Companies, Tiffin - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Tiffin
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