- Labels & Tags, Portland
- Laboratories Medical, Portland
- Laboratories Pathological, Portland
- Landscape Contractors & Designers, Portland
- Landscaping, Portland
- Late Night Restaurants, Portland
- Lawn & Garden Equipment & Supplies, Portland
- Lawn & Garden Services, Portland
- Lawn & Garden Sprinkler Systems, Portland
- Lawn Maintenance Services, Portland
- Lawn Mower Repair & Blade Sharpening Service, Portland
- Lawn Mowers & Power Equipment, Portland
- Lawyers & Attorneys, Portland
- Legal Professionals, Portland
- Libraries, Portland
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- Life Insurance, Portland
- Lime & Limestone, Portland
- Limousine Service, Portland
- Liquid & Bulk Storage, Portland
- Liquor Stores, Portland
- Loans Check Cashing, Portland
- Loans Personal, Portland
- Loans Title Services, Portland
- Locks, Portland
- Locksmiths, Portland - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Portland
- Lodging, Portland
- Lodging Services, Portland
- Long Haul Trucking Companies, Portland
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