- Racing Car Supplies, Northville
- Racing Engines, Northville
- Racing Including Track Operations, Northville
- Real Estate, Northville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Northville
- Real Estate Appraiser, Northville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Northville
- Real Estate Consultants, Northville
- Real Estate Developers, Northville
- Real Estate Management, Northville
- Real Estate Services, Northville
- Record Storage, Destruction & Management, Northville
- Recreational Equipment & Supplies Companies, Northville
- Recycling & Sanitation Consultants, Northville
- Recycling Drop-Off Centers, Northville
- Recycling Pick Up Services, Northville
- Recycling Scrap & Waste Materials, Northville - Scrap Metal, etc
- Reflexologists, Northville
- Refrigeration Repair & Service, Northville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Northville - Fridge
- Refuse Collection & Disposal, Northville
- Refuse Systems & Garbage Disposal, Northville
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- Rehabilitation Centers, Products & Services, Northville
- Rehabilitation Specialists, Northville
- Rehabilitational Job Training Services, Northville
- Religious Education, Northville
- Religious Organizations, Northville
- Religious Practitioners, Northville
- Repair Services, Northville
- Research Services, Northville
- Residential, Northville
- Residential Apartments, Northville
- Residential Care Facilities, Northville
- Residential Construction Contractors, Northville - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Northville
- Restaurant Management & Consulting, Northville - Food Facilities Consultants
- Restaurants/Food & Dining, Northville
- Retail Book Stores, Northville
- Retirement Communities & Home, Assisted Living & Apartments, Northville
- Riding & Rodeo Services, Northville
- Riding Apparel & Equipment, Northville
- Rods Threaded & Plain, Northville
- Roofing Consultants, Northville - Roofing Companies
- Roofing Contractors, Northville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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