- Labor Organizations, Dayton
- Labor Unions, Dayton
- Laminated Plastic Plate & Sheet Manufacturers, Dayton
- Landscape Contractors & Designers, Dayton
- Landscaping, Dayton
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Dayton
- Lawyers & Attorneys, Dayton
- Legal Professionals, Dayton
- Licensed Counselors, Dayton
- Lighting Fixtures Repair, Maintenance & Installation, Dayton
- Limousine Service, Dayton
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- Linens, Dayton
- Liquor & Beer Manufacturers, Dayton
- Liquor Stores, Dayton
- Lithograph Inks Manufacturers, Dayton
- Locks, Dayton
- Locksmiths, Dayton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Dayton
- Lodging, Dayton
- Long Haul Trucking Companies, Dayton
- Lutheran Church, Dayton
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