- Landscape Contractors & Designers, Sylvan Lake
- Landscaping, Sylvan Lake
- Landscaping Materials & Supplies, Sylvan Lake
- Laundromats & Dry-Cleaning, Coin-Operated, Sylvan Lake
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Sylvan Lake
- Lawn & Garden Equipment & Supplies, Sylvan Lake
- Lawn Mowers & Power Equipment, Sylvan Lake
- Lawyers & Attorneys, Sylvan Lake
- Legal Professionals, Sylvan Lake
- Libraries, Sylvan Lake
- License & Registry Services, Sylvan Lake
- Life Insurance, Sylvan Lake
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- Lions Clubs, Sylvan Lake
- Liquid Filters, Sylvan Lake
- Liquid Transportation - Non Hazardous, Sylvan Lake
- Liquor Stores, Sylvan Lake
- Loans Personal, Sylvan Lake
- Locks, Sylvan Lake
- Locksmiths, Sylvan Lake - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sylvan Lake
- Lodging, Sylvan Lake
- Long Haul Trucking Companies, Sylvan Lake
- Lumber & Lumber Products, Sylvan Lake
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