- Racing Including Track Operations, Parkville
- Radiator Coolant & Solvents, Parkville - Engine Coolant
- Radiotelephone Communications, Parkville
- Real Estate, Parkville - Agent, Broker & Companies
- Real Estate & Insurance Schools, Parkville
- Real Estate Agencies, Parkville
- Real Estate Appraisers & Consulting Services, Parkville
- Real Estate Consultants, Parkville
- Real Estate Developers, Parkville
- Real Estate Management, Parkville
- Real Estate Services, Parkville
- Record Storage, Destruction & Management, Parkville
- Recording Studio - Equipment & Rental, Parkville
- Recording Studio Service - Sound & Video, Parkville
- Recycling Scrap & Waste Materials, Parkville - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Parkville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Parkville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Parkville - Fridge
- Refuse Collection & Disposal, Parkville
- Refuse Systems & Garbage Disposal, Parkville
- Rehabilitation Centers, Parkville
- Rehabilitation Centers, Products & Services, Parkville
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- Rehabilitation Specialists, Parkville
- Religious Organizations, Parkville
- Religious Practitioners, Parkville
- Rental Property Management, Parkville
- Repair Services, Parkville
- Research Services, Parkville
- Residential, Parkville
- Residential Apartments, Parkville
- Residential Care Facilities, Parkville
- Residential Construction Contractors, Parkville - General Contractors
- Restaurant Equipment, Parkville
- Restaurant Equipment & Supplies, Parkville
- Restaurant Supplies & Equipment, Parkville
- Restaurants/Food & Dining, Parkville
- Resume Service, Parkville
- Retail Book Stores, Parkville
- Retirement Communities & Home, Assisted Living & Apartments, Parkville
- Rigging Service & Crane Hoisting, Parkville
- Roadside Assistance, Road Service & Towing Service, Parkville
- Roofing Consultants, Parkville - Roofing Companies
- Roofing Contractors, Parkville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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