- Real Estate, Orono - Agent, Broker & Companies
- Real Estate Developers, Orono
- Real Estate Management, Orono
- Real Estate Services, Orono
- Religious Organizations, Orono
- Repair Services, Orono
- Research & Development Bureaus, Orono - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Orono - Laboratories
- Research Services, Orono
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- Residential, Orono
- Residential Apartments, Orono
- Restaurants/Food & Dining, Orono
- Retirement Communities & Home, Assisted Living & Apartments, Orono
- Riding & Rodeo Services, Orono
- Riding Equipment, Orono
- Rodeo & Equestrian Equipment & Supplies, Orono
- Rods, Springs & Suspension Equipment & Supplies, Orono
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