- Railroad & Subway Construction Contractors, Ardrossan
- Railroad Contractors, Ardrossan
- Real Estate, Ardrossan - Agent, Broker & Companies
- Real Estate Services, Ardrossan
- Recreational Services, Ardrossan
- Recycling Drop-Off Centers, Ardrossan
- Reducing Exercise & Weight Control Services, Ardrossan
- Refrigeration & Air Conditioning Contractors, Ardrossan - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Ardrossan - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Religious Education, Ardrossan
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- Religious Organizations, Ardrossan
- Repair Services, Ardrossan
- Residential Construction Contractors, Ardrossan - General Contractors
- Residential Electricians, Ardrossan - Electric Contractors
- Resorts & Hotels, Ardrossan
- Restaurants/Food & Dining, Ardrossan
- Riding & Rodeo Services, Ardrossan
- Roofing Consultants, Ardrossan - Roofing Companies
- Roofing Contractors, Ardrossan - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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