- Laboratory Equipment Repair & Service, East Rochester
- Land Surveyor, East Rochester - Land Surveying Services
- Landscape Contractors & Designers, East Rochester
- Landscaping, East Rochester
- Landscaping Materials & Supplies, East Rochester
- Laser Equipment Repair & Service, East Rochester
- Laundry & Dry Cleaning Equipment & Supplies, East Rochester - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, East Rochester
- Lawn & Garden Equipment & Supplies, East Rochester
- Lawn & Garden Services, East Rochester
- Lawn & Garden Sprinkler Systems, East Rochester
- Lawn Maintenance Services, East Rochester
- Lawyers & Attorneys, East Rochester
- Leather Goods, East Rochester
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- Leather Tanning & Finishing Manufacturers, East Rochester
- Legal Professionals, East Rochester
- Lennox Air Conditioning, East Rochester - Air Conditioner Contractors & Systems
- Libraries, East Rochester
- Liquor Stores, East Rochester
- Locks, East Rochester
- Locksmiths, East Rochester - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, East Rochester
- Lodging, East Rochester
- Lodging Services, East Rochester
- Long Haul Trucking Companies, East Rochester
- Lumber & Lumber Products, East Rochester
- Lumber & Lumber Products, East Rochester
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