- Land Surveyor, Dunnville - Land Surveying Services
- Landscape Contractors & Designers, Dunnville
- Landscaping, Dunnville
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Dunnville
- Lawn & Garden Equipment & Supplies, Dunnville
- Lawn & Garden Services, Dunnville
- Lawn Mowers & Power Equipment, Dunnville
- Lawyers & Attorneys, Dunnville
- Legal & Tax Services, Dunnville
- Legal Professionals, Dunnville
- Libraries, Dunnville
- License & Registry Services, Dunnville
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- Life Insurance, Dunnville
- Lighting Fixtures & Equipment, Dunnville
- Liquid Transportation - Non Hazardous, Dunnville
- Liquor & Beer Manufacturers, Dunnville
- Liquor Stores, Dunnville
- Live Theaters, Dunnville
- Livestock, Dunnville
- Loans Personal, Dunnville
- Lodging, Dunnville
- Long Haul Trucking Companies, Dunnville
- Long Term Care Facility, Dunnville
- Lutheran Church, Dunnville
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