- Laboratories Dental, Mountlake Terrace
- Laboratories Medical, Mountlake Terrace
- Land Surveyor, Mountlake Terrace - Land Surveying Services
- Landscape Contractors & Designers, Mountlake Terrace
- Landscaping, Mountlake Terrace
- Language Schools, Mountlake Terrace
- Language Training Aids, Mountlake Terrace
- Laundry Self Service, Mountlake Terrace
- Lawn & Garden Services, Mountlake Terrace
- Lawn Maintenance Services, Mountlake Terrace
- Lawyers & Attorneys, Mountlake Terrace
- Legal Professionals, Mountlake Terrace
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- License Services, Mountlake Terrace
- Life Insurance, Mountlake Terrace
- Lighting Consultants & Designers, Mountlake Terrace
- Lighting Fixtures & Equipment, Mountlake Terrace
- Liquor Stores, Mountlake Terrace
- Locks, Mountlake Terrace
- Locksmiths, Mountlake Terrace - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Mountlake Terrace
- Lodging, Mountlake Terrace
- Lodging Services, Mountlake Terrace
- Long Haul Trucking Companies, Mountlake Terrace
- Lutheran Church, Mountlake Terrace
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