- Railroad Companies, Old Town
- Ready Mix Concrete, Old Town - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Old Town
- Real Estate, Old Town - Agent, Broker & Companies
- Real Estate Services, Old Town
- Recreational Services, Old Town
- Recycling Drop-Off Centers, Old Town
- Refuse Collection & Disposal Services, Old Town
- Religious Organizations, Old Town
- Rental & Leasing Business Equipment, Old Town
- Repair Services, Old Town
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- Repossession Services, Old Town
- Research & Development Labs, Old Town - Laboratories
- Research Services, Old Town
- Residential, Old Town
- Residential Apartments, Old Town
- Residential Landfills, Old Town
- Restaurants/Food & Dining, Old Town
- Retirement Communities & Home, Assisted Living & Apartments, Old Town
- Riding & Rodeo Services, Old Town
- Roofing Materials & Supplies, Old Town
- Rooming & Boarding Houses, Old Town
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