- Racing Car Supplies, Ambler
- Radiator Coolant & Solvents, Ambler - Engine Coolant
- Radiator Repair, Ambler - Gas Tank Repair
- Railroad Engineer, Ambler
- Real Estate, Ambler - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Ambler
- Real Estate Appraiser, Ambler - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ambler
- Real Estate Consultants, Ambler
- Real Estate Developers, Ambler
- Real Estate Management, Ambler
- Real Estate Services, Ambler
- Recording Studio - Equipment & Rental, Ambler
- Records, Tapes, CDs - Used & Vintage, Ambler
- Recreational Equipment & Supplies Companies, Ambler
- Recreational Organizations, Ambler
- Recycling Scrap & Waste Materials, Ambler - Scrap Metal, etc
- Reform Synagogues, Ambler
- Refrigeration & Air Conditioning Contractors, Ambler - Installation, Repair, Sales & Service
- Refuse Systems & Garbage Disposal, Ambler
- Rehabilitation Centers, Products & Services, Ambler
- Rehabilitation Specialists, Ambler
- Rehabilitational Job Training Services, Ambler
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- Religious Organizations, Ambler
- Religious Practitioners, Ambler
- Repair Services, Ambler
- Research & Development Bureaus, Ambler - Commercial, Economic, Sociological & Educational Research
- Research Services, Ambler
- Residential, Ambler
- Residential Apartments, Ambler
- Residential Care Facilities, Ambler
- Residential Construction Contractors, Ambler - General Contractors
- Resins Wholesale & Retail, Ambler - Plastic Raw Materials
- Restaurant & Food Service Management Services, Ambler
- Restaurant & Lounge, Bar, Or Pub, Ambler
- Restaurants/Food & Dining, Ambler
- Restoration Contractors, Ambler
- Retail Book Stores, Ambler
- Retirement Communities & Home, Assisted Living & Apartments, Ambler
- Riding Apparel & Equipment, Ambler
- Road Construction, Ambler - Companies & Contractors
- Roofing Consultants, Ambler - Roofing Companies
- Roofing Contractors, Ambler - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Ambler
- Rubber Products - Retail, Ambler
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