- Radio Communications Equipment & Systems , Fitchburg
- Radio Manufacturers, Fitchburg
- Radio Stations & Broadcasting Companies, Fitchburg
- Radon Testing & Services, Fitchburg
- Railroad & Subway Construction Contractors, Fitchburg
- Railroad Contractors, Fitchburg
- Rape Victim Services, Fitchburg
- Reading Instruction Schools, Fitchburg
- Real Estate, Fitchburg - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Fitchburg
- Real Estate Appraisers & Consulting Services, Fitchburg
- Real Estate Consultants, Fitchburg
- Real Estate Developers, Fitchburg
- Real Estate Management, Fitchburg
- Real Estate Rentals, Fitchburg
- Real Estate Services, Fitchburg
- Real Estate Staging Service, Fitchburg
- Record Storage, Destruction & Management, Fitchburg
- Recreational Good Manufacturers, Fitchburg
- Recycling Drop-Off Centers, Fitchburg
- Recycling Scrap & Waste Materials, Fitchburg - Scrap Metal, etc
- Refrigerated Beverage Dispenser, Fitchburg - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Fitchburg - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigerator Sales, Service & Repair, Fitchburg - Fridge
- Refuse Collection & Disposal Services, Fitchburg
- Refuse Systems & Garbage Disposal, Fitchburg
- Rehabilitation Centers, Products & Services, Fitchburg
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- Rehabilitation Specialists, Fitchburg
- Religious Goods & Church Supplies Stores, Fitchburg
- Religious Organizations, Fitchburg
- Religious Services, Fitchburg
- Rental & Leasing Business Equipment, Fitchburg
- Repair Services, Fitchburg
- Research & Development Bureaus, Fitchburg - Commercial, Economic, Sociological & Educational Research
- Research Services, Fitchburg
- Residential, Fitchburg
- Residential Apartments, Fitchburg
- Residential Care Facilities, Fitchburg
- Residential Construction Contractors, Fitchburg - General Contractors
- Resorts & Hotels, Fitchburg
- Restaurant Equipment, Fitchburg
- Restaurant Equipment & Supplies, Fitchburg
- Restaurant Management & Consulting, Fitchburg - Food Facilities Consultants
- Restaurant Supplies & Equipment, Fitchburg
- Restaurants/Food & Dining, Fitchburg
- Resume Service, Fitchburg
- Rheumatologists, Fitchburg - Rheumatology Doctors, Physicians & Surgeons
- Roadside Assistance, Road Service & Towing Service, Fitchburg
- Robotic Components, Fitchburg
- Roofing & Siding Materials, Equipments & Supplies, Fitchburg - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Fitchburg - Roofing Companies
- Roofing Contractors, Fitchburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Fitchburg
- Ryder Truck Rental , Fitchburg - Ryder Moving
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