- Radio Stations & Broadcasting Companies, Houghton
- Ready Mix Concrete, Houghton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Houghton
- Real Estate, Houghton - Agent, Broker & Companies
- Real Estate Agencies, Houghton
- Real Estate Agent & Broker Services, Houghton
- Real Estate Agent - Property Lessors, Houghton
- Real Estate Appraiser, Houghton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Houghton
- Real Estate Broker, Houghton
- Real Estate Consultants, Houghton
- Real Estate Developers, Houghton
- Real Estate Management, Houghton
- Real Estate Services, Houghton
- Reflexologists, Houghton
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- Religious Organizations, Houghton
- Religious Practitioners, Houghton
- Religious Services, Houghton
- Relocation Services, Houghton
- Repair Services, Houghton
- Residential, Houghton
- Residential Apartments, Houghton
- Residential Construction Contractors, Houghton - General Contractors
- Resorts & Hotels, Houghton
- Restaurant & Lounge, Bar, Or Pub, Houghton
- Restaurant Equipment Cleaning, Houghton - Restaurant Cleaners
- Restaurants/Food & Dining, Houghton
- Retail Book Stores, Houghton
- Roofing Consultants, Houghton - Roofing Companies
- Roofing Contractors, Houghton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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