- Racing Car Supplies, Wentzville
- Radio & Television Repair Shops , Wentzville - TV Repair
- Radiology Equipment & Services, Wentzville - X-Ray Equipment & Supplies
- Radiotelephone Communications, Wentzville
- Railroad Companies, Wentzville
- Ready Mix Concrete, Wentzville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Wentzville
- Real Estate, Wentzville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Wentzville
- Real Estate Appraiser, Wentzville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Wentzville
- Real Estate Listings Services, Wentzville
- Real Estate Management, Wentzville
- Real Estate Rentals, Wentzville
- Real Estate Services, Wentzville
- Reducing Exercise & Weight Control Services, Wentzville
- Refrigeration & Cooling Equipment, Parts & Supplies , Wentzville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Wentzville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Wentzville - Fridge
- Refuse Collection & Disposal Services, Wentzville
- Rehabilitation Centers, Products & Services, Wentzville
- Rehabilitation Specialists, Wentzville
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- Rehabilitational Job Training Services, Wentzville
- Religious Education, Wentzville
- Religious Organizations, Wentzville
- Repair Services, Wentzville
- Research & Development Bureaus, Wentzville - Commercial, Economic, Sociological & Educational Research
- Research Services, Wentzville
- Residential, Wentzville
- Residential Apartments, Wentzville
- Residential Care Facilities, Wentzville
- Residential Construction Contractors, Wentzville - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Wentzville
- Restaurant Equipment Repair & Service, Wentzville - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants - Breakfast Brunch Lunch, Wentzville
- Restaurants/Food & Dining, Wentzville
- Retaining Wall Contractors, Wentzville - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Wentzville
- Riding & Rodeo Services, Wentzville
- Rigging Service & Crane Hoisting, Wentzville
- Roofing Consultants, Wentzville - Roofing Companies
- Roofing Contractors, Wentzville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Wentzville
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