- Labor & Employment Consultants, Lowell
- Labor And Employment Relations Attorneys & Lawyers, Lowell
- Labor And Employment Relations Lawyers & Attorneys, Lowell
- Labor Organizations, Lowell
- Labor Unions, Lowell
- Laboratories Dental, Lowell
- Laboratories Medical, Lowell
- Lamp Shades, Lowell
- Lamps & Lamp Shades Retail, Lowell - Desk, Table & Floor Lamps
- Land Surveyor, Lowell - Land Surveying Services
- Landscape Contractors & Designers, Lowell
- Landscape Design & Installation, Lowell
- Landscape Garden Services, Lowell
- Landscaping, Lowell
- Landscaping Materials & Supplies, Lowell
- Late Night Restaurants, Lowell
- Laundromats & Dry-Cleaning, Coin-Operated, Lowell
- Laundry & Dry Cleaning Equipment & Supplies, Lowell - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Lowell
- Laundry Self Service, Lowell
- Lawn & Garden Equipment & Supplies, Lowell
- Lawn & Garden Services, Lowell
- Lawn Hydroseeding, Lowell
- Lawn Mower Repair & Blade Sharpening Service, Lowell
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- Lawn Mowers & Power Equipment, Lowell
- Lawyers & Attorneys, Lowell
- Leather Apparel Goods Manufacturers, Lowell
- Leather Apparel Repair, Lowell
- Leather Goods, Lowell
- Leather Goods & Luggage Repair, Lowell
- Legal & Tax Services, Lowell
- Legal Professionals, Lowell
- Libraries, Lowell
- Licensed Counselors, Lowell
- Lighting Fixtures Repair, Maintenance & Installation, Lowell
- Limousine Service, Lowell
- Liquid Waste Treatment, Lowell
- Liquor & Beer Manufacturers, Lowell
- Liquor Stores, Lowell
- Live Theaters, Lowell
- Loans Personal, Lowell
- Locks, Lowell
- Locksmiths, Lowell - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Lowell
- Lodging, Lowell
- Long Haul Trucking Companies, Lowell
- Luncheonette Restaurants, Lowell
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