- Railroad Companies, Mcclellan
- Real Estate, Mcclellan - Agent, Broker & Companies
- Real Estate Developers, Mcclellan
- Real Estate Services, Mcclellan
- Recreational Organizations, Mcclellan
- Recycling Scrap & Waste Materials, Mcclellan - Scrap Metal, etc
- Refuse Collection & Disposal Services, Mcclellan
- Refuse Systems & Garbage Disposal, Mcclellan
- Rental & Leasing Business Equipment, Mcclellan
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- Repair Services, Mcclellan
- Research & Development Labs, Mcclellan - Laboratories
- Research Services, Mcclellan
- Restaurants/Food & Dining, Mcclellan
- Rock Climbing Indoor, Mcclellan
- Roofing Consultants, Mcclellan - Roofing Companies
- Roofing Contractors, Mcclellan - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Mcclellan
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