- Laboratories Medical, Portland
- Land Surveyor, Portland - Land Surveying Services
- Landscape Contractors & Designers, Portland
- Landscaping, Portland
- Landscaping Materials & Supplies, Portland
- Late Night Restaurants, Portland
- Laundry Equipment Rental & Leasing, Portland
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Portland
- Lawn & Garden Equipment & Supplies, Portland
- Lawn Mower Repair & Blade Sharpening Service, Portland
- Lawn Mowers & Power Equipment, Portland
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- Lawyers & Attorneys, Portland
- Legal Professionals, Portland
- Libraries, Portland
- Life Insurance, Portland
- Liquor Stores, Portland
- Livestock, Portland
- Loans Personal, Portland
- Lodging, Portland
- Long Haul Trucking Companies, Portland
- Lumber & Lumber Products, Portland
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