- Race Car Dealers, Frederick
- Racing Car Supplies, Frederick
- Racquetball Courts, Frederick
- Radio & Television Repair Shops , Frederick - TV Repair
- Radio Communications Equipment & Systems , Frederick
- Radio Equipment & Parts Stores & Dealers, Frederick
- Radio Station Equipment & Systems, Frederick
- Radio Stations & Broadcast Companies, Frederick - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Frederick
- Radioactive Materials, Frederick
- Radioactivity Detection Devices, Frederick
- Radiologists, Frederick - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Frederick
- Radon Testing & Services, Frederick
- Railroad Companies, Frederick
- Railroad Services, Frederick
- Ready Mix Concrete, Frederick - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Frederick
- Real Estate, Frederick - Agent, Broker & Companies
- Real Estate & Insurance Schools, Frederick
- Real Estate Agencies, Frederick
- Real Estate Agent - Property Lessors, Frederick
- Real Estate Appraiser, Frederick - Appraisal Services
- Real Estate Appraisers & Consulting Services, Frederick
- Real Estate Attorneys & Lawyers, Frederick
- Real Estate Consultants, Frederick
- Real Estate Developers, Frederick
- Real Estate Management, Frederick
- Real Estate Rentals, Frederick
- Real Estate Services, Frederick
- Real Estate Settlements, Frederick
- Record Storage, Destruction & Management, Frederick
- Records, Tapes, CDs - Used & Vintage, Frederick
- Recreational Equipment Repair & Service, Frederick
- Recreational Good Manufacturers, Frederick
- Recycling Drop-Off Centers, Frederick
- Recycling Scrap & Waste Materials, Frederick - Scrap Metal, etc
- Red Wing Shoes, Frederick
- Reducing Exercise & Weight Control Services, Frederick
- Reflexologists, Frederick
- Refrigeration & Air Conditioning Contractors, Frederick - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Frederick - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Frederick - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Frederick
- Refrigerator Sales, Service & Repair, Frederick - Fridge
- Refuse Collection & Disposal, Frederick
- Refuse Collection & Disposal Services, Frederick
- Refuse Systems & Garbage Disposal, Frederick
- Rehabilitation Centers, Frederick
- Rehabilitation Centers, Products & Services, Frederick
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- Rehabilitation Products, Frederick
- Rehabilitation Specialists, Frederick
- Rehabilitational Job Training Services, Frederick
- Religious Organizations, Frederick
- Religious Practitioners, Frederick
- Relocation Services, Frederick
- Rental & Leasing Business Equipment, Frederick
- Repair Services, Frederick
- Research & Development Bureaus, Frederick - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Frederick - Laboratories
- Research Clinics, Frederick
- Research Services, Frederick
- Residential, Frederick
- Residential Apartments, Frederick
- Residential Architect, Frederick
- Residential Care Facilities, Frederick
- Residential Construction Contractors, Frederick - General Contractors
- Residential Electricians, Frederick - Electric Contractors
- Residential Real Estate Companies, Frederick
- Resorts & Hotels, Frederick
- Resource Centers, Frederick
- Restaurant & Lounge, Bar, Or Pub, Frederick
- Restaurant Equipment, Frederick
- Restaurant Equipment & Supplies, Frederick
- Restaurant Management & Consulting, Frederick - Food Facilities Consultants
- Restaurant Supplies & Equipment, Frederick
- Restaurants - Breakfast Brunch Lunch, Frederick
- Restaurants/Food & Dining, Frederick
- Retail Book Stores, Frederick
- Retirement & Estate Planning, Frederick
- Retirement Communities & Home, Assisted Living & Apartments, Frederick
- Retirement Homes, Frederick
- Retirement Planning Consultants & Services, Frederick
- Rheem / Rudd Heating & Air Conditioning Contractors, Frederick - Air Conditioner Contractors & Systems
- Rheumatologists, Frederick - Rheumatology Doctors, Physicians & Surgeons
- Riding & Rodeo Services, Frederick
- Rigging Service & Crane Hoisting, Frederick
- Road Construction, Frederick - Companies & Contractors
- Road Construction & Repair Contractors, Frederick
- Road Construction Equipment & Machinery, Frederick
- Roadside Assistance, Road Service & Towing Service, Frederick
- Roof Cleaning & Maintenance, Frederick - Roofing Services
- Roof Repair, Frederick - Roofing Repair Services
- Roofing Consultants, Frederick - Roofing Companies
- Roofing Contractors, Frederick - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Frederick
- Rooming & Boarding Houses, Frederick
- RV & Campers Repair & Service, Frederick
- RV Repair, Frederick - Recreational Vehicle
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