- Labor & Employment Consultants, Sammamish
- Land Surveyor, Sammamish - Land Surveying Services
- Landscape Contractors & Designers, Sammamish
- Landscaping, Sammamish
- Late Night Restaurants, Sammamish
- Lawn & Garden Services, Sammamish
- Lawn Maintenance Services, Sammamish
- Lawyers & Attorneys, Sammamish
- Legal Professionals, Sammamish
- Libraries, Sammamish
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- Lighting Fixtures & Equipment, Sammamish
- Lighting Fixtures Repair, Maintenance & Installation, Sammamish
- Locks, Sammamish
- Locksmiths, Sammamish - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sammamish
- Lodging, Sammamish
- Long Haul Trucking Companies, Sammamish
- Lumber Importer, Sammamish
- Lutheran Church, Sammamish
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