- Labels & Tags, Duncan
- Laboratories Dental, Duncan
- Laboratories Medical, Duncan
- Land Surveyor, Duncan - Land Surveying Services
- Landscape Contractors & Designers, Duncan
- Landscaping, Duncan
- Late Night Restaurants, Duncan
- Laundromats & Dry-Cleaning, Coin-Operated, Duncan
- Laundry Self Service, Duncan
- Lawn & Garden Equipment & Supplies, Duncan
- Lawn & Garden Services, Duncan
- Lawn & Garden Sprinkler Systems, Duncan
- Lawn Maintenance Services, Duncan
- Lawn Mower Repair & Blade Sharpening Service, Duncan
- Lawn Mowers & Power Equipment, Duncan
- Lawyers & Attorneys, Duncan
- Legal & Tax Services, Duncan
- Legal Professionals, Duncan
- Libraries, Duncan
- License Services, Duncan
- Licensed Counselors, Duncan
- Life Insurance, Duncan
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- Lighting Fixtures & Equipment, Duncan
- Lighting Fixtures Repair, Maintenance & Installation, Duncan
- Liquor Stores, Duncan
- Live Theaters, Duncan
- Livestock, Duncan
- Livestock Trailers, Duncan
- Loans Check Cashing, Duncan
- Loans Personal, Duncan
- Loans Title Services, Duncan
- Local & Short Haul Trucking Companies, Duncan
- Locks, Duncan
- Locksmiths, Duncan - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Duncan
- Lodging, Duncan
- Lodging Services, Duncan
- Long Haul Trucking Companies, Duncan
- Lp Gas Equipment & Supplies, Duncan
- Lubricating Oils & Greases, Duncan
- Lumber & Lumber Products, Duncan
- Lumber & Lumber Products, Duncan
- Lutheran Church, Duncan
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