- Race Car Dealers, Waterville
- Radio & Television Repair Shops , Waterville - TV Repair
- Radio Communications Equipment & Systems , Waterville
- Radio Stations & Broadcasting Companies, Waterville
- Radiologists, Waterville - Radiology Doctors, Physicians & Surgeons
- Radon Testing & Services, Waterville
- Railroad Companies, Waterville
- Rape Victim Services, Waterville
- Reading Instruction Schools, Waterville
- Real Estate, Waterville - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Waterville
- Real Estate Appraiser, Waterville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Waterville
- Real Estate Broker, Waterville
- Real Estate Management, Waterville
- Real Estate Services, Waterville
- Record Destruction Service, Waterville
- Record Storage, Destruction & Management, Waterville
- Recording Studio Service - Sound & Video, Waterville
- Records, Tapes, CDs - Used & Vintage, Waterville
- Recreational Services, Waterville
- Recycling Drop-Off Centers, Waterville
- Rehabilitation Centers, Products & Services, Waterville
- Rehabilitation Specialists, Waterville
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- Religious Organizations, Waterville
- Religious Practitioners, Waterville
- Rent To Own Furniture, Waterville
- Rental & Leasing Business Equipment, Waterville
- Repair Services, Waterville
- Research & Development Bureaus, Waterville - Commercial, Economic, Sociological & Educational Research
- Research Services, Waterville
- Residential, Waterville
- Residential Apartments, Waterville
- Residential Care Facilities, Waterville
- Resource Centers, Waterville
- Restaurant & Food Service Management Services, Waterville
- Restaurant Management & Consulting, Waterville - Food Facilities Consultants
- Restaurants - Breakfast Brunch Lunch, Waterville
- Restaurants/Food & Dining, Waterville
- Retirement & Estate Planning, Waterville
- Retirement Communities & Home, Assisted Living & Apartments, Waterville
- Retirement Planning Consultants & Services, Waterville
- Reverends, Waterville
- Riding & Rodeo Services, Waterville
- Rigging Service & Crane Hoisting, Waterville
- Roofing Consultants, Waterville - Roofing Companies
- Roofing Contractors, Waterville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Waterville
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