- Laboratories Dental, Dubois
- Laboratories Medical, Dubois
- Land Planning Services, Dubois
- Land Surveyor, Dubois - Land Surveying Services
- Landscape Contractors & Designers, Dubois
- Landscaping, Dubois
- Laundry Self Service, Dubois
- Lawyers & Attorneys, Dubois
- Leather Goods, Dubois
- Leather Goods Cleaners & Dyers, Dubois
- Leather Goods Stores & Dealers, Dubois
- Leather Tanning & Finishing Manufacturers, Dubois
- Legal Professionals, Dubois
- Libraries, Dubois
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- Life Insurance, Dubois
- Liquor Stores, Dubois
- Litigation / Trial Attorneys & Lawyers, Dubois
- Livestock, Dubois
- Loans Personal, Dubois
- Lodging, Dubois
- Lodging Services, Dubois
- Log Homes - Log Cabins Builders, Dubois - Building Contractors
- Long Haul Trucking Companies, Dubois
- Lumber & Lumber Products, Dubois
- Lumber & Lumber Products, Dubois
- Lumber & Wood Products Manufacturers, Dubois
- Lutheran Church, Dubois
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