- Laboratories Medical, Troy
- Laboratory Equipment Repair & Service, Troy
- Land Surveyor, Troy - Land Surveying Services
- Landscape Contractors & Designers, Troy
- Landscaping, Troy
- Landscaping Materials & Supplies, Troy
- Laser Equipment Repair & Service, Troy
- Late Night Restaurants, Troy
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Troy
- Lawn & Garden Equipment & Supplies, Troy
- Lawn Mower Repair & Blade Sharpening Service, Troy
- Lawn Mowers & Power Equipment, Troy
- Lawyers & Attorneys, Troy
- Legal & Tax Services, Troy
- Legal Professionals, Troy
- Libraries, Troy
- License Services, Troy
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- Life Insurance, Troy
- Liquor Stores, Troy
- Loans Check Cashing, Troy
- Loans Personal, Troy
- Loans Title Services, Troy
- Local & Short Haul Trucking Companies, Troy
- Locks, Troy
- Locksmiths, Troy - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Troy
- Lodging, Troy
- Lodging Services, Troy
- Loggers, Troy
- Long Haul Trucking Companies, Troy
- Lubricating Oils , Troy - Motor Oil
- Lumber & Lumber Products, Troy
- Lumber & Lumber Products, Troy
- Lutheran Church, Troy
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