- Laboratories Biological, Denison
- Laboratories Medical, Denison
- Land Planning Services, Denison
- Land Surveyor, Denison - Land Surveying Services
- Landscape Contractors & Designers, Denison
- Landscape Garden Services, Denison
- Landscaping, Denison
- Landscaping Materials & Supplies, Denison
- Late Night Restaurants, Denison
- Laundry Self Service, Denison
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Denison
- Lawn & Garden Equipment & Supplies, Denison
- Lawn & Garden Services, Denison
- Lawn & Garden Sprinkler Systems, Denison
- Lawn Maintenance Services, Denison
- Lawyers & Attorneys, Denison
- Legal & Tax Services, Denison
- Legal Professionals, Denison
- Life Insurance, Denison
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- Lighting & Electrical Equipment Rental & Leasing, Denison
- Linen Supply Services, Denison
- Liquor Stores, Denison
- Live Theaters, Denison
- Livestock, Denison
- Loans Check Cashing, Denison
- Loans Personal, Denison
- Loans Title Services, Denison
- Locks, Denison
- Locksmiths, Denison - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Denison
- Lodging, Denison
- Lodging Services, Denison
- Long Haul Trucking Companies, Denison
- Lumber & Lumber Products, Denison
- Lumber & Lumber Products, Denison
- Lumber Companies, Denison - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Denison
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