- Radio Communications Equipment & Systems , Northumberland
- Railroad Companies, Northumberland
- Ready Mix Concrete, Northumberland - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Northumberland
- Real Estate, Northumberland - Agent, Broker & Companies
- Real Estate Appraiser, Northumberland - Appraisal Services
- Real Estate Appraisers & Consulting Services, Northumberland
- Real Estate Services, Northumberland
- Recreational Equipment & Supplies Companies, Northumberland
- Refrigerated Beverage Dispenser, Northumberland - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Northumberland - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refuse Collection & Disposal Services, Northumberland
- Religious Education, Northumberland
- Religious Organizations, Northumberland
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- Religious Practitioners, Northumberland
- Repair Services, Northumberland
- Residential, Northumberland
- Residential Apartments, Northumberland
- Residential Care Facilities, Northumberland
- Residential Construction Contractors, Northumberland - General Contractors
- Restaurants/Food & Dining, Northumberland
- Retirement Communities & Home, Assisted Living & Apartments, Northumberland
- Reverends, Northumberland
- Rigging Service & Crane Hoisting, Northumberland
- Roofing Consultants, Northumberland - Roofing Companies
- Roofing Contractors, Northumberland - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Northumberland
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