- Labor & Employment Consultants, Sudbury
- Labor Organizations, Sudbury
- Labor Relations Counselors, Sudbury
- Labor Unions, Sudbury
- Laboratories Dental, Sudbury
- Laboratories Medical, Sudbury
- Laboratory Equipment Repair & Service, Sudbury
- Laminating Services, Sudbury
- Land Surveyor, Sudbury - Land Surveying Services
- Landscape Contractors & Designers, Sudbury
- Landscaping, Sudbury
- Landscaping Materials & Supplies, Sudbury
- Language Schools, Sudbury
- Laser Equipment Repair & Service, Sudbury
- Laser Therapy Clinics, Sudbury
- Laundromats & Dry-Cleaning, Coin-Operated, Sudbury
- Laundry & Dry Cleaning Equipment & Supplies, Sudbury - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Sudbury
- Lawn & Garden Equipment & Supplies, Sudbury
- Lawn & Garden Services, Sudbury
- Lawn & Garden Sprinkler Systems, Sudbury
- Lawn Maintenance Services, Sudbury
- Lawn Mowers & Power Equipment, Sudbury
- Lawyers & Attorneys, Sudbury
- Leather Goods Cleaners & Dyers, Sudbury
- Leather Goods Stores & Dealers, Sudbury
- Legal & Tax Services, Sudbury
- Legal Information & Referral Services, Sudbury
- Legal Professionals, Sudbury
- Letter Signs, Sudbury
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- Libraries, Sudbury
- Life Insurance, Sudbury
- Lift Trucks, Sudbury
- Lighting Fixtures & Equipment, Sudbury
- Limousine Service, Sudbury
- Linen Supply Services, Sudbury
- Lingerie & Underwear for Women, Sudbury - Bras, Panties, Bustiers, Corsets & More
- Liquid Waste Removal, Sudbury
- Liquor Stores, Sudbury
- Live Theaters, Sudbury
- Livestock, Sudbury
- Living Room Furniture, Sudbury
- Loans Personal, Sudbury
- Local & Short Haul Trucking Companies, Sudbury
- Locks, Sudbury
- Locksmiths, Sudbury - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sudbury
- Lodging, Sudbury
- Lodging Services, Sudbury
- Log Homes - Log Cabins Builders, Sudbury - Building Contractors
- Logging Equipment & Supplies, Sudbury
- Logging Equipment & Supplies Manufacturers, Sudbury
- Long Haul Trucking Companies, Sudbury
- Lubricating Oils , Sudbury - Motor Oil
- Lumber & Lumber Products, Sudbury
- Lumber & Lumber Products, Sudbury
- Lumber & Wood Products Manufacturers, Sudbury
- Lumber Companies, Sudbury - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Sudbury
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