- Labor Organizations, Fostoria
- Laboratories Medical, Fostoria
- Lakes & Ponds Construction Maintenance Restoration & Control, Fostoria
- Landscape Contractors & Designers, Fostoria
- Landscaping, Fostoria
- Laundromats & Dry-Cleaning, Coin-Operated, Fostoria
- Laundry Self Service, Fostoria
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Fostoria
- Lawn & Garden Decor & Ornaments, Fostoria
- Lawn & Garden Equipment & Supplies, Fostoria
- Lawn & Garden Services, Fostoria
- Lawn Maintenance Services, Fostoria
- Lawn Mower Repair & Blade Sharpening Service, Fostoria
- Lawn Mowers & Power Equipment, Fostoria
- Lawyers & Attorneys, Fostoria
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- Legal Professionals, Fostoria
- Libraries, Fostoria
- Life Insurance, Fostoria
- Liquor Stores, Fostoria
- Livestock, Fostoria
- Livestock Equipment & Supplies, Fostoria
- Loans Personal, Fostoria
- Lodging, Fostoria
- Logistics Freight, Fostoria
- Long Haul Trucking Companies, Fostoria
- Lumber & Lumber Products, Fostoria
- Lumber & Lumber Products, Fostoria
- Lumber Companies, Fostoria - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Fostoria
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