- Racing Car Supplies, Gaithersburg
- Radiator Coolant & Solvents, Gaithersburg - Engine Coolant
- Radio & Television Repair Shops , Gaithersburg - TV Repair
- Radio Equipment & Parts Stores & Dealers, Gaithersburg
- Radio Stations & Broadcasting Companies, Gaithersburg
- Radiologists, Gaithersburg - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Gaithersburg
- Railroad & Subway Construction Contractors, Gaithersburg
- Railroad Companies, Gaithersburg
- Railroad Contractors, Gaithersburg
- Range & Oven Repair, Service & Sales, Gaithersburg
- Real Estate, Gaithersburg - Agent, Broker & Companies
- Real Estate & Insurance Schools, Gaithersburg
- Real Estate Agencies, Gaithersburg
- Real Estate Agent - Property Lessors, Gaithersburg
- Real Estate Appraiser, Gaithersburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Gaithersburg
- Real Estate Consultants, Gaithersburg
- Real Estate Developers, Gaithersburg
- Real Estate Investment Trusts, Gaithersburg
- Real Estate Management, Gaithersburg
- Real Estate Rentals, Gaithersburg
- Real Estate Services, Gaithersburg
- Record Storage, Destruction & Management, Gaithersburg
- Records, Tapes, CDs - Used & Vintage, Gaithersburg
- Recreation Management Services, Gaithersburg
- Recreational Equipment & Supplies Companies, Gaithersburg
- Recreational Services, Gaithersburg
- Recycling Drop-Off Centers, Gaithersburg
- Recycling Scrap & Waste Materials, Gaithersburg - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Gaithersburg
- Reflexologists, Gaithersburg
- Refrigerated Beverage Dispenser, Gaithersburg - Water Coolers Equipment & Supplies
- Refrigeration & Air Conditioning Contractors, Gaithersburg - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Gaithersburg - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Gaithersburg - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Gaithersburg - Fridge
- Refuse Collection & Disposal Services, Gaithersburg
- Rehabilitation Centers, Products & Services, Gaithersburg
- Rehabilitation Specialists, Gaithersburg
- Rehabilitational Job Training Services, Gaithersburg
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- Relief Organizations, Gaithersburg
- Religious Organizations, Gaithersburg
- Religious Schools Elementary Schools, Gaithersburg
- Rental & Leasing Business Equipment, Gaithersburg
- Repair Services, Gaithersburg
- Reprographic Services, Gaithersburg
- Research & Development Bureaus, Gaithersburg - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Gaithersburg - Laboratories
- Research Service Libraries, Gaithersburg
- Research Services, Gaithersburg
- Residential, Gaithersburg
- Residential Apartments, Gaithersburg
- Residential Care Facilities, Gaithersburg
- Residential Construction Contractors, Gaithersburg - General Contractors
- Resorts & Hotels, Gaithersburg
- Restaurant & Food Service Management Services, Gaithersburg
- Restaurant & Lounge, Bar, Or Pub, Gaithersburg
- Restaurant Equipment, Gaithersburg
- Restaurant Equipment & Supplies, Gaithersburg
- Restaurant Information & Referral Service, Gaithersburg
- Restaurant Lobster, Gaithersburg
- Restaurant Management & Consulting, Gaithersburg - Food Facilities Consultants
- Restaurant Supplies & Equipment, Gaithersburg
- Restaurants/Food & Dining, Gaithersburg
- Restoration Contractors, Gaithersburg
- Retail Book Stores, Gaithersburg
- Retirement & Estate Planning, Gaithersburg
- Retirement Communities & Home, Assisted Living & Apartments, Gaithersburg
- Retirement Communities & Homes, Gaithersburg
- Retirement Planning Consultants & Services, Gaithersburg
- Retirement Planning Services, Gaithersburg
- Riding & Rodeo Services, Gaithersburg
- Rigging Service & Crane Hoisting, Gaithersburg
- Road Construction, Gaithersburg - Companies & Contractors
- Road Construction & Repair Contractors, Gaithersburg
- Roof Repair, Gaithersburg - Roofing Repair Services
- Roofing Consultants, Gaithersburg - Roofing Companies
- Roofing Contractors, Gaithersburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Gaithersburg
- Rubbish Handling Equipment, Gaithersburg - Garbage Containers
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