- Radio Stations & Broadcasting Companies, Houlton
- Reading Instruction Schools, Houlton
- Ready Mix Concrete, Houlton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Houlton
- Real Estate, Houlton - Agent, Broker & Companies
- Real Estate Management, Houlton
- Real Estate Rentals, Houlton
- Real Estate Services, Houlton
- Rehabilitational Job Training Services, Houlton
- Religious Organizations, Houlton
- Rental & Leasing Business Equipment, Houlton
- Repair Services, Houlton
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- Research & Development Bureaus, Houlton - Commercial, Economic, Sociological & Educational Research
- Research Services, Houlton
- Residential, Houlton
- Residential Apartments, Houlton
- Residential Care Facilities, Houlton
- Restaurants/Food & Dining, Houlton
- Retail Book Stores, Houlton
- Retirement Communities & Home, Assisted Living & Apartments, Houlton
- Roofing Consultants, Houlton - Roofing Companies
- Roofing Contractors, Houlton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Houlton
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