- Race Car Manufacturers, Romulus
- Racing Car Supplies, Romulus
- Radiator Coolant & Solvents, Romulus - Engine Coolant
- Railroad Companies, Romulus
- Railroad Services, Romulus
- Ready Mix Concrete, Romulus - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Romulus
- Real Estate, Romulus - Agent, Broker & Companies
- Real Estate & Property Brokers, Romulus
- Real Estate Developers, Romulus
- Real Estate Properties, Romulus
- Real Estate Property Investment Properties, Romulus
- Real Estate Services, Romulus
- Record Storage, Destruction & Management, Romulus
- Recycling Drop-Off Centers, Romulus
- Recycling Scrap & Waste Materials, Romulus - Scrap Metal, etc
- Refuse Collection & Disposal, Romulus
- Refuse Collection & Disposal Services, Romulus
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- Refuse Systems & Garbage Disposal, Romulus
- Religious Organizations, Romulus
- Religious Practitioners, Romulus
- Rental & Leasing Business Equipment, Romulus
- Repair Services, Romulus
- Research Services, Romulus
- Residential, Romulus
- Residential Apartments, Romulus
- Residential Construction Contractors, Romulus - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Romulus
- Restaurant Equipment, Romulus
- Restaurant Equipment & Supplies, Romulus
- Restaurant Supplies & Equipment, Romulus
- Restaurants/Food & Dining, Romulus
- Retail Book Stores, Romulus
- Riding & Rodeo Services, Romulus
- Roofing Consultants, Romulus - Roofing Companies
- Roofing Contractors, Romulus - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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