- Laboratories Medical, Port Perry
- Laminating Services, Port Perry
- Land Surveyor, Port Perry - Land Surveying Services
- Landscape Contractors & Designers, Port Perry
- Landscaping, Port Perry
- Landscaping Materials & Supplies, Port Perry
- Lawn & Garden Equipment & Supplies, Port Perry
- Lawn & Garden Services, Port Perry
- Lawn Bowling, Port Perry
- Lawn Maintenance Services, Port Perry
- Lawn Mowers & Power Equipment, Port Perry
- Lawyers & Attorneys, Port Perry
- Legal & Tax Services, Port Perry
- Legal Professionals, Port Perry
- Letter Signs, Port Perry
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- Libraries, Port Perry
- Life Insurance, Port Perry
- Limousine Service, Port Perry
- Lingerie & Underwear for Women, Port Perry - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Port Perry
- Live Theaters, Port Perry
- Livestock, Port Perry
- Livestock Dealers, Port Perry
- Loans Personal, Port Perry
- Lodging, Port Perry
- Long Haul Trucking Companies, Port Perry
- Lubricating Oils , Port Perry - Motor Oil
- Lumber & Lumber Products, Port Perry
- Lumber & Lumber Products, Port Perry
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