- Laboratories Dental, Sunnyside
- Laboratories Medical, Sunnyside
- Land Surveyor, Sunnyside - Land Surveying Services
- Landscape Contractors & Designers, Sunnyside
- Landscaping, Sunnyside
- Late Night Restaurants, Sunnyside
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Sunnyside
- Lawn & Garden Equipment & Supplies, Sunnyside
- Lawn & Garden Services, Sunnyside
- Lawn & Garden Sprinkler Systems, Sunnyside
- Lawn Maintenance Services, Sunnyside
- Lawyers & Attorneys, Sunnyside
- Legal Professionals, Sunnyside
- Libraries, Sunnyside
- License Services, Sunnyside
- Licensed Counselors, Sunnyside
- Life Insurance, Sunnyside
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- Limousine Service, Sunnyside
- Linen Supply Services, Sunnyside
- Liquor Stores, Sunnyside
- Livestock, Sunnyside
- Livestock Feeding Service, Sunnyside
- Loans Personal, Sunnyside
- Locks, Sunnyside
- Locksmiths, Sunnyside - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sunnyside
- Lodging, Sunnyside
- Lodging Services, Sunnyside
- Long Haul Trucking Companies, Sunnyside
- Lubricating Oils , Sunnyside - Motor Oil
- Lumber & Lumber Products, Sunnyside
- Lumber & Lumber Products, Sunnyside
- Lutheran Church, Sunnyside
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