- Land Companies, Douglas
- Land Surveyor, Douglas - Land Surveying Services
- Landscape Contractors & Designers, Douglas
- Landscaping, Douglas
- Laundry Self Service, Douglas
- Lawn & Garden Equipment & Supplies, Douglas
- Lawn & Garden Services, Douglas
- Lawn & Garden Sprinkler Systems, Douglas
- Lawn Maintenance Services, Douglas
- Lawyers & Attorneys, Douglas
- Legal & Tax Services, Douglas
- Legal Professionals, Douglas
- Libraries, Douglas
- Life Insurance, Douglas
- Liquid Transportation - Non Hazardous, Douglas
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- Liquor & Beer Manufacturers, Douglas
- Liquor Stores, Douglas
- Livestock, Douglas
- Livestock Dealers, Douglas
- Livestock Feeding Service, Douglas
- Loans Personal, Douglas
- Lodging, Douglas
- Lodging Services, Douglas
- Long Haul Trucking Companies, Douglas
- Lp Gas Equipment & Supplies, Douglas
- Lubricating Oils , Douglas - Motor Oil
- Lumber & Lumber Products, Douglas
- Lumber & Lumber Products, Douglas
- Lutheran Church, Douglas
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