- Racing Car Supplies, Lambertville
- Radiology Equipment & Services, Lambertville - X-Ray Equipment & Supplies
- Real Estate, Lambertville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Lambertville
- Real Estate Appraiser, Lambertville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Lambertville
- Real Estate Management, Lambertville
- Real Estate Services, Lambertville
- Recreational Good Manufacturers, Lambertville
- Religious Organizations, Lambertville
- Repair Services, Lambertville
- Residential, Lambertville
- Residential Apartments, Lambertville
- Residential Care Facilities, Lambertville
- Residential Construction Contractors, Lambertville - General Contractors
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- Restaurant Equipment, Lambertville
- Restaurant Equipment & Supplies, Lambertville
- Restaurant Equipment Cleaning, Lambertville - Restaurant Cleaners
- Restaurant Management & Consulting, Lambertville - Food Facilities Consultants
- Restaurant Supplies & Equipment, Lambertville
- Restaurants/Food & Dining, Lambertville
- Retail Book Stores, Lambertville
- Retirement Homes, Lambertville
- Riding & Rodeo Services, Lambertville
- Road Construction, Lambertville - Companies & Contractors
- Road Construction & Repair Contractors, Lambertville
- Road Construction Equipment & Machinery, Lambertville
- Roofing Consultants, Lambertville - Roofing Companies
- Roofing Contractors, Lambertville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Lambertville
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