- Racing Car Supplies, Parker
- Radio Stations & Broadcasting Companies, Parker
- Railroad Companies, Parker
- Real Estate, Parker - Agent, Broker & Companies
- Real Estate Appraiser, Parker - Appraisal Services
- Real Estate Appraisers & Consulting Services, Parker
- Real Estate Developers, Parker
- Real Estate Services, Parker
- Recreational Equipment & Supplies Companies, Parker
- Recreational Vehicles & Campers Rent & Lease, Parker
- Recycling Scrap & Waste Materials, Parker - Scrap Metal, etc
- Refuse Collection & Disposal Services, Parker
- Refuse Systems & Garbage Disposal, Parker
- Religious Organizations, Parker
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- Repair Services, Parker
- Residential, Parker
- Residential Apartments, Parker
- Resorts & Hotels, Parker
- Restaurant & Lounge, Bar, Or Pub, Parker
- Restaurants/Food & Dining, Parker
- Roofing Consultants, Parker - Roofing Companies
- Roofing Contractors, Parker - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Parker
- RV & Campers Repair & Service, Parker
- Rv Parks, Parker
- RV Repair, Parker - Recreational Vehicle
- Rvs Sales, Rental & Leasing, Parker
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