- Radio & Tv Communications Equipment Manufacturers, Callahan
- Radiotelephone Communications, Callahan
- Real Estate, Callahan - Agent, Broker & Companies
- Real Estate Appraiser, Callahan - Appraisal Services
- Real Estate Appraisers & Consulting Services, Callahan
- Real Estate Developers, Callahan
- Real Estate Management, Callahan
- Real Estate Services, Callahan
- Recycling Drop-Off Centers, Callahan
- Refrigeration Repair & Service, Callahan - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Callahan
- Refuse Systems & Garbage Disposal, Callahan
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- Rehabilitation Centers, Products & Services, Callahan
- Rehabilitation Specialists, Callahan
- Religious Organizations, Callahan
- Rental Property Management, Callahan
- Repair Services, Callahan
- Residential, Callahan
- Residential Apartments, Callahan
- Restaurants/Food & Dining, Callahan
- Rigging Service & Crane Hoisting, Callahan
- Roofing Consultants, Callahan - Roofing Companies
- Roofing Contractors, Callahan - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Callahan
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