- Radio & Television Repair Shops , Mattituck - TV Repair
- Railroad, Mattituck - Commuter & Passenger Transport
- Real Estate, Mattituck - Agent, Broker & Companies
- Real Estate Appraiser, Mattituck - Appraisal Services
- Real Estate Appraisers & Consulting Services, Mattituck
- Real Estate Attorneys & Lawyers, Mattituck
- Real Estate Lawyers & Attorneys, Mattituck
- Real Estate Management, Mattituck
- Real Estate Services, Mattituck
- Recreational Equipment Repair & Service, Mattituck
- Refrigerated Beverage Dispenser, Mattituck - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Mattituck - Water Cooler, Ice Machine, Beverage Dispenser, etc
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- Refuse Collection & Disposal, Mattituck
- Refuse Systems & Garbage Disposal, Mattituck
- Religious Organizations, Mattituck
- Repair Services, Mattituck
- Residential Construction Contractors, Mattituck - General Contractors
- Restaurants/Food & Dining, Mattituck
- Retaining Wall Contractors, Mattituck - Build & Repair - Blocks, Concrete, Stones, etc
- Riding & Rodeo Services, Mattituck
- Rodeo & Equestrian Equipment & Supplies, Mattituck
- Roofing Consultants, Mattituck - Roofing Companies
- Roofing Contractors, Mattituck - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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