- Radar Equipment & Supplies, Merrimack
- Real Estate, Merrimack - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Merrimack
- Real Estate Appraiser, Merrimack - Appraisal Services
- Real Estate Appraisers & Consulting Services, Merrimack
- Real Estate Consultants, Merrimack
- Real Estate Developers, Merrimack
- Real Estate Management, Merrimack
- Real Estate Services, Merrimack
- Record Storage, Destruction & Management, Merrimack
- Recreational Good Manufacturers, Merrimack
- Recycling Scrap & Waste Materials, Merrimack - Scrap Metal, etc
- Refiners & Smelters Metals, Merrimack
- Refrigeration & Air Conditioning Contractors, Merrimack - Installation, Repair, Sales & Service
- Refuse Collection & Disposal, Merrimack
- Refuse Systems & Garbage Disposal, Merrimack
- Religious Education, Merrimack
- Religious Organizations, Merrimack
- Repair Services, Merrimack
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- Research & Development Bureaus, Merrimack - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Merrimack - Laboratories
- Research Services, Merrimack
- Residential, Merrimack
- Residential Care Facilities, Merrimack
- Residential Construction Contractors, Merrimack - General Contractors
- Residential Real Estate - Rental & Leasing, Merrimack
- Restaurants/Food & Dining, Merrimack
- Resume Service, Merrimack
- Retirement & Estate Planning, Merrimack
- Retirement Communities & Home, Assisted Living & Apartments, Merrimack
- Retirement Planning Consultants & Services, Merrimack
- Rigging Service & Crane Hoisting, Merrimack
- Road Construction, Merrimack - Companies & Contractors
- Road Construction & Repair Contractors, Merrimack
- Roofing Consultants, Merrimack - Roofing Companies
- Roofing Contractors, Merrimack - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Merrimack
- RV Repair, Merrimack - Recreational Vehicle
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