- Labor Organizations, Cambridge
- Laboratories Medical, Cambridge
- Laboratories X-Ray, Cambridge
- Landscape Contractors & Designers, Cambridge
- Landscaping, Cambridge
- Late Night Restaurants, Cambridge
- Laundry Equipment Rental & Leasing, Cambridge
- Laundry Self Service, Cambridge
- Lawn & Garden Equipment & Supplies, Cambridge
- Lawn & Garden Services, Cambridge
- Lawn Maintenance Services, Cambridge
- Lawn Mower Repair & Blade Sharpening Service, Cambridge
- Lawn Mowers & Power Equipment, Cambridge
- Lawyers & Attorneys, Cambridge
- Legal Professionals, Cambridge
- Libraries, Cambridge
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- License Services, Cambridge
- Life Insurance, Cambridge
- Lighting Fixtures & Equipment, Cambridge
- Liquor Stores, Cambridge
- Live Theaters, Cambridge
- Livestock, Cambridge
- Loans Agricultural, Cambridge
- Loans Personal, Cambridge
- Lodging, Cambridge
- Lodging Services, Cambridge
- Long Haul Trucking Companies, Cambridge
- Lumber & Lumber Products, Cambridge
- Lumber & Lumber Products, Cambridge
- Lumber Brokers, Cambridge
- Lutheran Church, Cambridge
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