- Racing Car Supplies, Ionia
- Radiator Coolant & Solvents, Ionia - Engine Coolant
- Railroad Companies, Ionia
- Ready Mix Concrete, Ionia - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ionia
- Real Estate, Ionia - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Ionia
- Real Estate Agent - Property Lessors, Ionia
- Real Estate Broker, Ionia
- Real Estate Services, Ionia
- Recording Studio - Equipment & Rental, Ionia
- Recording Studio Equipment, Ionia
- Recording Studio Service - Sound & Video, Ionia
- Rehabilitation Centers, Products & Services, Ionia
- Rehabilitation Specialists, Ionia
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- Religious Organizations, Ionia
- Rental & Leasing Business Equipment, Ionia
- Repair Services, Ionia
- Residential, Ionia
- Residential Apartments, Ionia
- Residential Construction Contractors, Ionia - General Contractors
- Resorts & Hotels, Ionia
- Restaurants/Food & Dining, Ionia
- Restoration Contractors, Ionia
- Retirement Communities & Home, Assisted Living & Apartments, Ionia
- Roadside Assistance, Road Service & Towing Service, Ionia
- Roller Skating Rinks, Ionia
- Roofing Consultants, Ionia - Roofing Companies
- Roofing Contractors, Ionia - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Ionia
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