- Radio Communications Equipment & Systems , Wallingford
- Railroad & Subway Construction Contractors, Wallingford
- Railroad Contractors, Wallingford
- Real Estate, Wallingford - Agent, Broker & Companies
- Real Estate Services, Wallingford
- Rehabilitation Centers, Products & Services, Wallingford
- Rehabilitation Specialists, Wallingford
- Religious Organizations, Wallingford
- Repair Services, Wallingford
- Residential, Wallingford
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- Residential Apartments, Wallingford
- Residential Construction Contractors, Wallingford - General Contractors
- Restaurant Equipment, Wallingford
- Restaurant Equipment & Supplies, Wallingford
- Restaurant Supplies & Equipment, Wallingford
- Restaurants/Food & Dining, Wallingford
- Retail Book Stores, Wallingford
- Retirement Communities & Home, Assisted Living & Apartments, Wallingford
- Roofing Consultants, Wallingford - Roofing Companies
- Roofing Contractors, Wallingford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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