- Racing Including Track Operations, Somerton
- Radiator Coolant & Solvents, Somerton - Engine Coolant
- Raw Products, Somerton
- Real Estate, Somerton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Somerton
- Real Estate Services, Somerton
- Refrigerated Storage & Warehouse, Somerton - Warehousing
- Religious Organizations, Somerton
- Rendering Companies, Somerton
- Repair Services, Somerton
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- Research Services, Somerton
- Residential, Somerton
- Residential Apartments, Somerton
- Residential Construction Contractors, Somerton - General Contractors
- Restaurants - Breakfast Brunch Lunch, Somerton
- Restaurants/Food & Dining, Somerton
- Retirement Communities & Home, Assisted Living & Apartments, Somerton
- Roofing Consultants, Somerton - Roofing Companies
- Roofing Contractors, Somerton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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