- Radio & Television Repair Shops , Chelmsford - TV Repair
- Radio Stations & Broadcast Companies, Chelmsford - Radio, Television & Publishers Representatives
- Radiotelephone Communications, Chelmsford
- Ready Mix Concrete, Chelmsford - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Chelmsford
- Real Estate, Chelmsford - Agent, Broker & Companies
- Real Estate Attorneys & Lawyers, Chelmsford
- Real Estate Lawyers & Attorneys, Chelmsford
- Real Estate Management, Chelmsford
- Real Estate Services, Chelmsford
- Record Storage, Destruction & Management, Chelmsford
- Recording Studio Equipment, Chelmsford
- Records, Tapes, CDs - Used & Vintage, Chelmsford
- Recreational Services, Chelmsford
- Recycling Drop-Off Centers, Chelmsford
- Reducing Exercise & Weight Control Services, Chelmsford
- Rehabilitation Centers, Products & Services, Chelmsford
- Rehabilitation Specialists, Chelmsford
- Religious Organizations, Chelmsford
- Repair Services, Chelmsford
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- Research & Development Bureaus, Chelmsford - Commercial, Economic, Sociological & Educational Research
- Research Services, Chelmsford
- Residential, Chelmsford
- Residential Apartments, Chelmsford
- Residential Care Facilities, Chelmsford
- Resorts & Hotels, Chelmsford
- Restaurants/Food & Dining, Chelmsford
- Resume Service, Chelmsford
- Retail Book Stores, Chelmsford
- Retirement & Estate Planning, Chelmsford
- Retirement Communities & Home, Assisted Living & Apartments, Chelmsford
- Retirement Home Referral Service, Chelmsford - Nursing Home & Care Facilities Referrals & Information
- Retirement Planning Consultants & Services, Chelmsford
- Riding & Rodeo Services, Chelmsford
- Rigging Service & Crane Hoisting, Chelmsford
- Roofing Consultants, Chelmsford - Roofing Companies
- Roofing Contractors, Chelmsford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Chelmsford
- Rv Parks, Chelmsford
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