- Racing Including Track Operations, Chelmsford
- Radio & Television Repair Shops , Chelmsford - TV Repair
- Railroad Companies, Chelmsford
- Ready Mix Concrete, Chelmsford - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Chelmsford
- Real Estate, Chelmsford - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Chelmsford
- Real Estate Broker, Chelmsford
- Real Estate Services, Chelmsford
- Recording Studio - Equipment & Rental, Chelmsford
- Refrigerated Beverage Dispenser, Chelmsford - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Chelmsford - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Religious Organizations, Chelmsford
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- Repair Services, Chelmsford
- Research Services, Chelmsford
- Residential, Chelmsford
- Residential Apartments, Chelmsford
- Restaurants/Food & Dining, Chelmsford
- Retirement Communities & Home, Assisted Living & Apartments, Chelmsford
- Riding & Rodeo Services, Chelmsford
- Road Construction, Chelmsford - Companies & Contractors
- Road Construction & Repair Contractors, Chelmsford
- Roofing Consultants, Chelmsford - Roofing Companies
- Roofing Contractors, Chelmsford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Chelmsford
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