- Labor Organizations, Beamsville
- Landscape Contractors & Designers, Beamsville
- Landscaping, Beamsville
- Laundromats & Dry-Cleaning, Coin-Operated, Beamsville
- Laundry Self Service, Beamsville
- Lawn & Garden Equipment & Supplies, Beamsville
- Lawn & Garden Services, Beamsville
- Lawn & Garden Sprinkler Systems, Beamsville
- Lawn Maintenance Services, Beamsville
- Lawyers & Attorneys, Beamsville
- Lead Testing, Detection & Removal - Commercial & Industrial, Beamsville - Lead Paint
- Lead Testing, Detection & Removal - Residential, Beamsville - Lead Paint
- Legal & Tax Services, Beamsville
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- Legal Professionals, Beamsville
- Libraries, Beamsville
- Life Insurance, Beamsville
- Linen Supply Services, Beamsville
- Liquid Waste Removal, Beamsville
- Liquor Stores, Beamsville
- Living Room Furniture, Beamsville
- Lodging, Beamsville
- Long Haul Trucking Companies, Beamsville
- Long Term Care Facility, Beamsville
- Lumber & Wood Products Manufacturers, Beamsville
- Lumber Companies, Beamsville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Beamsville
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