- Radon Testing & Services, Windham
- Real Estate, Windham - Agent, Broker & Companies
- Real Estate Services, Windham
- Recreational Services, Windham
- Refrigeration & Cooling Equipment, Parts & Supplies , Windham - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Windham - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Windham - Fridge
- Refuse Collection & Disposal Services, Windham
- Rehabilitational Job Training Services, Windham
- Religious Organizations, Windham
- Repair Services, Windham
- Research & Development Labs, Windham - Laboratories
- Research Services, Windham
- Resident Camps, Windham
- Residential, Windham
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- Residential Apartments, Windham
- Residential Construction Contractors, Windham - General Contractors
- Restaurant Equipment, Windham
- Restaurant Equipment & Supplies, Windham
- Restaurant Supplies & Equipment, Windham
- Restaurants/Food & Dining, Windham
- Riding & Rodeo Services, Windham
- Rigging Equipment & Supplies, Windham
- Rigging Service & Crane Hoisting, Windham
- Rodeo & Equestrian Equipment & Supplies, Windham
- Roofing Consultants, Windham - Roofing Companies
- Roofing Contractors, Windham - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Windham
- RV Repair, Windham - Recreational Vehicle
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