- Racing Car Supplies, Williamsport
- Radiator Coolant & Solvents, Williamsport - Engine Coolant
- Radiator Repair, Williamsport - Gas Tank Repair
- Radiator Repair & Rebuild, Williamsport
- Radio & Television Repair Shops , Williamsport - TV Repair
- Radio Communications Equipment & Systems , Williamsport
- Radio Stations & Broadcasting Companies, Williamsport
- Radiologists, Williamsport - Radiology Doctors, Physicians & Surgeons
- Railroad, Williamsport - Commuter & Passenger Transport
- Railroad Companies, Williamsport
- Real Estate, Williamsport - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Williamsport
- Real Estate Appraiser, Williamsport - Appraisal Services
- Real Estate Appraisers & Consulting Services, Williamsport
- Real Estate Attorneys & Lawyers, Williamsport
- Real Estate Attorneys & Lawyers, Williamsport
- Real Estate Consultants, Williamsport
- Real Estate Developers, Williamsport
- Real Estate Lawyers & Attorneys, Williamsport
- Real Estate Management, Williamsport
- Real Estate Rentals, Williamsport
- Real Estate Services, Williamsport
- Real Estate Services Franchises, Williamsport
- Record Destruction Service, Williamsport
- Record Storage, Destruction & Management, Williamsport
- Recording Studio - Equipment & Rental, Williamsport
- Recording Studio Service - Sound & Video, Williamsport
- Recreation Management Services, Williamsport
- Recreational Equipment Repair & Service, Williamsport
- Recreational Services, Williamsport
- Recycling Drop-Off Centers, Williamsport
- Recycling Scrap & Waste Materials, Williamsport - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Williamsport
- Reflexologists, Williamsport
- Reform Synagogues, Williamsport
- Refrigerated Storage & Warehouse, Williamsport - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Williamsport - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Williamsport - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Williamsport - Fridge
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- Refuse Collection & Disposal Services, Williamsport
- Rehabilitation Centers, Products & Services, Williamsport
- Rehabilitation Specialists, Williamsport
- Rehabilitational Job Training Services, Williamsport
- Relief Organizations, Williamsport
- Religious Goods & Church Supplies Stores, Williamsport
- Religious Organizations, Williamsport
- Religious Practitioners, Williamsport
- Religious Services, Williamsport
- Relocation Services, Williamsport
- Repair Services, Williamsport
- Research & Development Bureaus, Williamsport - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Williamsport - Laboratories
- Research Services, Williamsport
- Residential, Williamsport
- Residential Apartments, Williamsport
- Residential Care Facilities, Williamsport
- Residential Construction Contractors, Williamsport - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Williamsport
- Restaurant Equipment, Williamsport
- Restaurant Equipment & Supplies, Williamsport
- Restaurant Equipment Repair & Service, Williamsport - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, Williamsport
- Restaurant Supplies & Equipment, Williamsport
- Restaurants/Food & Dining, Williamsport
- Retail Book Stores, Williamsport
- Retirement & Estate Planning, Williamsport
- Retirement Communities & Home, Assisted Living & Apartments, Williamsport
- Retirement Planning Consultants & Services, Williamsport
- Reverends, Williamsport
- Rigging Equipment & Supplies, Williamsport
- Rigging Service & Crane Hoisting, Williamsport
- Road Construction, Williamsport - Companies & Contractors
- Road Construction & Repair Contractors, Williamsport
- Rods, Springs & Suspension Equipment & Supplies, Williamsport
- Roofing Consultants, Williamsport - Roofing Companies
- Roofing Contractors, Williamsport - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Williamsport
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