- Racing Car Supplies, Maricopa
- Radiologists, Maricopa - Radiology Doctors, Physicians & Surgeons
- Railroad Companies, Maricopa
- Real Estate, Maricopa - Agent, Broker & Companies
- Real Estate Developers, Maricopa
- Real Estate Services, Maricopa
- Recycling Scrap & Waste Materials, Maricopa - Scrap Metal, etc
- Reformed Churches, Maricopa
- Religious Organizations, Maricopa
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- Repair Services, Maricopa
- Research Services, Maricopa
- Residential Construction Contractors, Maricopa - General Contractors
- Resorts & Hotels, Maricopa
- Restaurant & Lounge, Bar, Or Pub, Maricopa
- Restaurants - Breakfast Brunch Lunch, Maricopa
- Restaurants/Food & Dining, Maricopa
- Retail Book Stores, Maricopa
- Rv Parks, Maricopa
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