- Laboratories Dental, Portland
- Laboratories Medical, Portland
- Landscape Contractors & Designers, Portland
- Landscaping, Portland
- Laundromats & Dry-Cleaning, Coin-Operated, Portland
- Laundry Self Service, Portland
- Lawn & Garden Equipment & Supplies, Portland
- Lawn & Garden Services, Portland
- Lawn & Garden Sprinkler Systems, Portland
- Lawn Maintenance Services, Portland
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