- Radio Stations & Broadcasting Companies, Glennallen
- Radiotelephone Communications, Glennallen
- Ready Mix Concrete, Glennallen - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Glennallen
- Real Estate, Glennallen - Agent, Broker & Companies
- Real Estate Services, Glennallen
- Recreational Services, Glennallen
- Religious Organizations, Glennallen
- Repair Services, Glennallen
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- Research & Development Bureaus, Glennallen - Commercial, Economic, Sociological & Educational Research
- Research Services, Glennallen
- Residential, Glennallen
- Residential Apartments, Glennallen
- Residential Landfills, Glennallen
- Resorts & Hotels, Glennallen
- Restaurants/Food & Dining, Glennallen
- Rv Parks, Glennallen
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