- Race Track Equipment & Supplies, Rockville
- Racquetball Courts, Rockville
- Radiator Coolant & Solvents, Rockville - Engine Coolant
- Radiator Repair, Rockville - Gas Tank Repair
- Radio & Television Repair Shops , Rockville - TV Repair
- Radio Communications Equipment & Systems , Rockville
- Radio Station Equipment & Systems, Rockville
- Radio Stations & Broadcasting Companies, Rockville
- Radiologists, Rockville - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Rockville
- Radon Testing & Services, Rockville
- Ready Mix Concrete, Rockville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Rockville
- Real Estate, Rockville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Rockville
- Real Estate Appraiser, Rockville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Rockville
- Real Estate Attorneys & Lawyers, Rockville
- Real Estate Attorneys & Lawyers, Rockville
- Real Estate Consultants, Rockville
- Real Estate Developers, Rockville
- Real Estate Investment Trusts, Rockville
- Real Estate Lawyers & Attorneys, Rockville
- Real Estate Listings Services, Rockville
- Real Estate Management, Rockville
- Real Estate Rentals, Rockville
- Real Estate Services, Rockville
- Record Storage, Destruction & Management, Rockville
- Recording Studio - Equipment & Rental, Rockville
- Recording Studio Equipment, Rockville
- Recording Studio Service - Sound & Video, Rockville
- Records, Tapes, CDs - Used & Vintage, Rockville
- Recreational Services, Rockville
- Recreational Vehicles & Campers Rent & Lease, Rockville
- Recycling Drop-Off Centers, Rockville
- Recycling Scrap & Waste Materials, Rockville - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Rockville
- Reflexologists, Rockville
- Refrigeration & Air Conditioning Contractors, Rockville - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Rockville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Rockville - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Rockville
- Refrigerator Sales, Service & Repair, Rockville - Fridge
- Refuse Collection & Disposal Services, Rockville
- Rehabilitation Centers, Rockville
- Rehabilitation Centers, Products & Services, Rockville
- Rehabilitation Specialists, Rockville
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- Rehabilitational Job Training Services, Rockville
- Relief Organizations, Rockville
- Religious Education, Rockville
- Religious Goods & Church Supplies Stores, Rockville
- Religious Organizations, Rockville
- Relocation Services, Rockville
- Rental & Leasing Business Equipment, Rockville
- Rental Property Management, Rockville
- Repair Services, Rockville
- Reprographic Services, Rockville
- Research & Development Bureaus, Rockville - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Rockville - Laboratories
- Research Film Laboratories & Film Services Motion Pictures, Rockville
- Research Service Libraries, Rockville
- Research Services, Rockville
- Residential, Rockville
- Residential Apartments, Rockville
- Residential Architect, Rockville
- Residential Care Facilities, Rockville
- Residential Construction Contractors, Rockville - General Contractors
- Residential Real Estate Companies, Rockville
- Resorts & Hotels, Rockville
- Restaurant & Food Service Management Services, Rockville
- Restaurant & Lounge, Bar, Or Pub, Rockville
- Restaurant Equipment, Rockville
- Restaurant Equipment & Supplies, Rockville
- Restaurant Management & Consulting, Rockville - Food Facilities Consultants
- Restaurant Supplies & Equipment, Rockville
- Restaurants/Food & Dining, Rockville
- Retail Book Stores, Rockville
- Retaining Wall Contractors, Rockville - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Rockville
- Retirement Communities & Home, Assisted Living & Apartments, Rockville
- Retirement Communities & Homes, Rockville
- Retirement Home Referral Service, Rockville - Nursing Home & Care Facilities Referrals & Information
- Retirement Homes, Rockville
- Retirement Planning Consultants & Services, Rockville
- Ride Share Information, Rockville
- Rifle & Pistol Ranges, Rockville
- Rigging Service & Crane Hoisting, Rockville
- Risk Management Consultants, Rockville
- Roadside Assistance, Road Service & Towing Service, Rockville
- Roof Repair, Rockville - Roofing Repair Services
- Roofing Consultants, Rockville - Roofing Companies
- Roofing Contractors, Rockville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Rockville
- Rvs Sales, Rental & Leasing, Rockville
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