- Laboratories Dental, Lowell
- Laboratories Medical, Lowell
- Lamp Shades, Lowell
- Lamps & Lamp Shades Retail, Lowell - Desk, Table & Floor Lamps
- Landscape Contractors & Designers, Lowell
- Landscape Lighting, Lowell
- Landscaping, Lowell
- Landscaping Materials & Supplies, Lowell
- Late Night Restaurants, Lowell
- Lawn & Garden Decor & Ornaments, Lowell
- Lawn & Garden Equipment & Supplies, Lowell
- Lawn & Garden Services, Lowell
- Lawn & Tree Service, Lowell
- Lawn Maintenance Services, Lowell
- Lawn Mower Repair & Blade Sharpening Service, Lowell
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- Lawn Mowers & Power Equipment, Lowell
- Lawyers & Attorneys, Lowell
- Lead Testing, Detection & Removal - Commercial & Industrial, Lowell - Lead Paint
- Lead Testing, Detection & Removal - Residential, Lowell - Lead Paint
- Legal Professionals, Lowell
- Life Insurance, Lowell
- Lighting Fixtures & Equipment, Lowell
- Lime & Limestone, Lowell
- Liquor Stores, Lowell
- Loans Farm & Ranch, Lowell
- Lodging, Lowell
- Logistics Freight, Lowell
- Long Haul Trucking Companies, Lowell
- Lutheran Church, Lowell
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