- Laboratories Dental, Guymon
- Laboratories Medical, Guymon
- Land Surveyor, Guymon - Land Surveying Services
- Landscaping, Guymon
- Laundry Equipment Rental & Leasing, Guymon
- Laundry Self Service, Guymon
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Guymon
- Lawn & Garden Decor & Ornaments, Guymon
- Lawn & Garden Equipment & Supplies, Guymon
- Lawn & Garden Services, Guymon
- Lawn Maintenance Services, Guymon
- Lawn Mowers & Power Equipment, Guymon
- Lawyers & Attorneys, Guymon
- Legal Professionals, Guymon
- Libraries, Guymon
- License Services, Guymon
- Life Insurance, Guymon
- Linen Supply Services, Guymon
- Liquor Stores, Guymon
- Live Theaters, Guymon
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- Livestock, Guymon
- Livestock Breeders, Guymon
- Livestock Dealers, Guymon
- Livestock Equipment & Supplies, Guymon
- Livestock Feeding Service, Guymon
- Livestock Services, Guymon
- Living Word Church, Guymon
- Loans Check Cashing, Guymon
- Loans Personal, Guymon
- Loans Title Services, Guymon
- Locks, Guymon
- Locksmiths, Guymon - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Guymon
- Lodging, Guymon
- Lodging Services, Guymon
- Long Haul Trucking Companies, Guymon
- Lumber & Lumber Products, Guymon
- Lumber & Lumber Products, Guymon
- Lutheran Church, Guymon
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