- Labeling Service, Duncanville
- Labor & Employment Consultants, Duncanville
- Laboratories Dental, Duncanville
- Laboratories Medical, Duncanville
- Landscape Contractors & Designers, Duncanville
- Landscaping, Duncanville
- Landscaping Materials & Supplies, Duncanville
- Laser Hair Removal, Duncanville
- Late Night Restaurants, Duncanville
- Laundromats & Dry-Cleaning, Coin-Operated, Duncanville
- Lawn & Garden Equipment & Supplies, Duncanville
- Lawn & Garden Services, Duncanville
- Lawn Maintenance Services, Duncanville
- Lawn Mower Repair & Blade Sharpening Service, Duncanville
- Lawyers & Attorneys, Duncanville
- Leather Goods & Luggage Repair, Duncanville
- Legal Professionals, Duncanville
- Life Insurance, Duncanville
- Lighting Fixtures & Equipment, Duncanville
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- Liquor Stores, Duncanville
- Live Theaters, Duncanville
- Livestock, Duncanville
- Loans Personal, Duncanville
- Loans Title Services, Duncanville
- Local & Short Haul Trucking Companies, Duncanville
- Locks, Duncanville
- Locksmiths, Duncanville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Duncanville
- Lodging, Duncanville
- Lodging Services, Duncanville
- Logistics Freight, Duncanville
- Long Haul Trucking Companies, Duncanville
- Lp Gas Equipment & Supplies, Duncanville
- Lumber & Lumber Products, Duncanville
- Lumber & Lumber Products, Duncanville
- Lumber Companies, Duncanville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Duncanville
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