- Radio & Tv Communications Equipment Manufacturers, Titusville
- Railroad Companies, Titusville
- Rape Victim Services, Titusville
- Reading Instruction Schools, Titusville
- Ready Mix Concrete, Titusville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Titusville
- Real Estate, Titusville - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Titusville
- Real Estate Appraiser, Titusville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Titusville
- Real Estate Broker, Titusville
- Real Estate Developers, Titusville
- Real Estate Rentals, Titusville
- Real Estate Services, Titusville
- Recreational Equipment Repair & Service, Titusville
- Rehabilitation Centers, Products & Services, Titusville
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- Rehabilitation Specialists, Titusville
- Religious Organizations, Titusville
- Rental & Leasing Business Equipment, Titusville
- Repair Services, Titusville
- Research Services, Titusville
- Residential, Titusville
- Residential Apartments, Titusville
- Residential Care Facilities, Titusville
- Residential Construction Contractors, Titusville - General Contractors
- Resorts & Hotels, Titusville
- Restaurants/Food & Dining, Titusville
- Retirement Communities & Home, Assisted Living & Apartments, Titusville
- Roofing Consultants, Titusville - Roofing Companies
- Roofing Contractors, Titusville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Titusville
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