- Radio Communications Equipment & Systems , Trinity
- Radiotelephone Communications, Trinity
- Real Estate, Trinity - Agent, Broker & Companies
- Real Estate Appraiser, Trinity - Appraisal Services
- Real Estate Appraisers & Consulting Services, Trinity
- Real Estate Services, Trinity
- Recreation Management Services, Trinity
- Recycling Drop-Off Centers, Trinity
- Recycling Scrap & Waste Materials, Trinity - Scrap Metal, etc
- Refuse Systems & Garbage Disposal, Trinity
- Rehabilitation Centers, Products & Services, Trinity
- Rehabilitation Specialists, Trinity
- Religious Organizations, Trinity
- Repair Services, Trinity
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- Research Services, Trinity
- Residential, Trinity
- Residential Apartments, Trinity
- Residential Care Facilities, Trinity
- Residential Construction Contractors, Trinity - General Contractors
- Residential Landfills, Trinity
- Resorts & Hotels, Trinity
- Restaurant & Lounge, Bar, Or Pub, Trinity
- Restaurants/Food & Dining, Trinity
- Roofing Consultants, Trinity - Roofing Companies
- Roofing Contractors, Trinity - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Contractors Referral Services, Trinity
- Roofing Siding & Sheet Metal Referral Services, Trinity
- Rv Parks, Trinity
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