- Labor Organizations, Port Hope
- Laboratories Medical, Port Hope
- Lacquers Manufacturers, Port Hope
- Lamp Shades, Port Hope
- Lamps & Lamp Shades Retail, Port Hope - Desk, Table & Floor Lamps
- Landscape Contractors & Designers, Port Hope
- Landscaping, Port Hope
- Laundromats & Dry-Cleaning, Coin-Operated, Port Hope
- Lawn & Garden Equipment & Supplies, Port Hope
- Lawn & Garden Services, Port Hope
- Lawn Maintenance Services, Port Hope
- Lawn Mowers & Power Equipment, Port Hope
- Lawyers & Attorneys, Port Hope
- Legal & Tax Services, Port Hope
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- Legal Professionals, Port Hope
- Libraries, Port Hope
- Life Insurance, Port Hope
- Liquor Stores, Port Hope
- Lithographic Printing, Port Hope
- Live Theaters, Port Hope
- Livestock, Port Hope
- Loans Personal, Port Hope
- Local & Short Haul Trucking Companies, Port Hope
- Locks, Port Hope
- Locksmiths, Port Hope - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Port Hope
- Lodging, Port Hope
- Long Haul Trucking Companies, Port Hope
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