- Laboratories Dental, West Yarmouth
- Laboratories Medical, West Yarmouth
- Lamp Shades, West Yarmouth
- Lamps & Lamp Shades Retail, West Yarmouth - Desk, Table & Floor Lamps
- Landscape Contractors & Designers, West Yarmouth
- Landscape Lighting, West Yarmouth
- Landscaping, West Yarmouth
- Laser Game Centers, West Yarmouth
- Lawn & Garden Equipment & Supplies, West Yarmouth
- Lawn & Garden Sprinkler Systems, West Yarmouth
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- Lawyers & Attorneys, West Yarmouth
- Legal Professionals, West Yarmouth
- Licensed Counselors, West Yarmouth
- Lighting Fixtures & Equipment, West Yarmouth
- Linings Clothing, West Yarmouth
- Liquor Stores, West Yarmouth
- Lodging, West Yarmouth
- Lodging Services, West Yarmouth
- Lumber & Lumber Products, West Yarmouth
- Lumber & Lumber Products, West Yarmouth
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