- Radio Stations & Broadcasting Companies, Wonder Lake
- Rail Line Travel Agents & Agencies, Wonder Lake
- Railroad, Wonder Lake - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Wonder Lake
- Railroad Companies, Wonder Lake
- Railroad Contractors, Wonder Lake
- Real Estate, Wonder Lake - Agent, Broker & Companies
- Real Estate Services, Wonder Lake
- Recording Studio - Equipment & Rental, Wonder Lake
- Recording Studio Service - Sound & Video, Wonder Lake
- Recycling Drop-Off Centers, Wonder Lake
- Refrigeration Repair & Service, Wonder Lake - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Wonder Lake - Fridge
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- Relief Organizations, Wonder Lake
- Religious Organizations, Wonder Lake
- Religious Practitioners, Wonder Lake
- Rental & Leasing Business Equipment, Wonder Lake
- Repair Services, Wonder Lake
- Research & Development Bureaus, Wonder Lake - Commercial, Economic, Sociological & Educational Research
- Research Services, Wonder Lake
- Residential Care Facilities, Wonder Lake
- Residential Construction Contractors, Wonder Lake - General Contractors
- Restaurants/Food & Dining, Wonder Lake
- Roofing Consultants, Wonder Lake - Roofing Companies
- Roofing Contractors, Wonder Lake - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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