- Labor & Employment Consultants, Fairmont
- Labor Organizations, Fairmont
- Labor Relations Counselors, Fairmont
- Laboratories Dental, Fairmont
- Laboratories Medical, Fairmont
- Land Companies, Fairmont
- Land Surveyor, Fairmont - Land Surveying Services
- Landscape Contractors & Designers, Fairmont
- Landscaping, Fairmont
- Late Night Restaurants, Fairmont
- Laundromats & Dry-Cleaning, Coin-Operated, Fairmont
- Laundry & Dry Cleaning Equipment & Supplies, Fairmont - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Fairmont
- Laundry Self Service, Fairmont
- Lawn & Garden Equipment & Supplies, Fairmont
- Lawn Mower Repair & Blade Sharpening Service, Fairmont
- Lawn Mowers & Power Equipment, Fairmont
- Lawyers & Attorneys, Fairmont
- Legal & Tax Services, Fairmont
- Legal Professionals, Fairmont
- Libraries, Fairmont
- License Services, Fairmont
- Life Insurance, Fairmont
- Lighting Fixtures & Equipment, Fairmont
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- Lime & Limestone, Fairmont
- Limousine Service, Fairmont
- Lining Materials, Fairmont
- Livestock, Fairmont
- Livestock Grooming, Fairmont
- Livestock Trailers, Fairmont
- Loans Personal, Fairmont
- Local & Short Haul Trucking Companies, Fairmont
- Locks, Fairmont
- Locks Commercial & Industrial, Fairmont
- Locksmiths, Fairmont - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Commercial & Industrial, Fairmont
- Locksmiths Equipment & Supplies, Fairmont
- Lodging, Fairmont
- Lodging Services, Fairmont
- Long Haul Trucking Companies, Fairmont
- Long Term Care Facility, Fairmont
- Lottery Drawing Announcement, Fairmont
- Lottery Game Retailers, Fairmont
- Lumber & Lumber Products, Fairmont
- Lumber & Lumber Products, Fairmont
- Lumber Companies, Fairmont - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Fairmont
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