- Radiator Coolant & Solvents, Ottumwa - Engine Coolant
- Radiator Repair, Ottumwa - Gas Tank Repair
- Radio Communications Equipment & Systems , Ottumwa
- Radio Stations & Broadcast Companies, Ottumwa - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Ottumwa
- Radiologists, Ottumwa - Radiology Doctors, Physicians & Surgeons
- Railroad Companies, Ottumwa
- Ready Mix Concrete, Ottumwa - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Ottumwa
- Real Estate, Ottumwa - Agent, Broker & Companies
- Real Estate Appraiser, Ottumwa - Appraisal Services
- Real Estate Appraisers & Consulting Services, Ottumwa
- Real Estate Developers, Ottumwa
- Real Estate Farms & Ranches, Ottumwa
- Real Estate Properties, Ottumwa
- Real Estate Recreational & Resort, Ottumwa
- Real Estate Services, Ottumwa
- Recording Studio Service - Sound & Video, Ottumwa
- Recreational Organizations, Ottumwa
- Recycling Drop-Off Centers, Ottumwa
- Recycling Scrap & Waste Materials, Ottumwa - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Ottumwa - Warehousing
- Refrigerated Truck, Ottumwa
- Refuse Collection & Disposal Services, Ottumwa
- Rehabilitation Centers, Products & Services, Ottumwa
- Rehabilitation Specialists, Ottumwa
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- Rehabilitational Job Training Services, Ottumwa
- Relief Organizations, Ottumwa
- Religious Education, Ottumwa
- Religious Goods & Church Supplies Stores, Ottumwa
- Religious Organizations, Ottumwa
- Rental & Leasing Business Equipment, Ottumwa
- Repair Services, Ottumwa
- Research Services, Ottumwa
- Residential, Ottumwa
- Residential Apartments, Ottumwa
- Residential Care Facilities, Ottumwa
- Restaurant & Lounge, Bar, Or Pub, Ottumwa
- Restaurants/Food & Dining, Ottumwa
- Retail Book Stores, Ottumwa
- Retirement Communities & Home, Assisted Living & Apartments, Ottumwa
- Rigging Service & Crane Hoisting, Ottumwa
- Road Construction, Ottumwa - Companies & Contractors
- Road Construction & Repair Contractors, Ottumwa
- Road Construction Equipment & Machinery, Ottumwa
- Roadside Assistance, Road Service & Towing Service, Ottumwa
- Roofing Consultants, Ottumwa - Roofing Companies
- Roofing Contractors, Ottumwa - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Ottumwa
- Rv Parks, Ottumwa
- RV Repair, Ottumwa - Recreational Vehicle
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