- Laboratories Dental, Merrimack
- Laboratories Medical, Merrimack
- Ladies Ready To Wear, Merrimack
- Land Companies, Merrimack
- Landscape Contractors & Designers, Merrimack
- Landscaping, Merrimack
- Late Night Restaurants, Merrimack
- Laundry Self Service, Merrimack
- Lawn & Garden Equipment & Supplies, Merrimack
- Lawn & Garden Services, Merrimack
- Lawn Maintenance Services, Merrimack
- Lawyers & Attorneys, Merrimack
- Legal Professionals, Merrimack
- Life Insurance, Merrimack
- Lighting Fixtures & Equipment, Merrimack
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- Limousine Service, Merrimack
- Lingerie & Underwear for Women, Merrimack - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Merrimack
- Liquor Stores, Merrimack
- Livestock, Merrimack
- Living Room Furniture, Merrimack
- Locks, Merrimack
- Locksmiths, Merrimack - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Merrimack
- Lodging, Merrimack
- Lodging Services, Merrimack
- Long Haul Trucking Companies, Merrimack
- Luggage & Accessories , Merrimack
- Lumber & Lumber Products, Merrimack
- Lumber & Lumber Products, Merrimack
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