- Racing Car Supplies, Rowland Heights
- Radio & Television Repair Shops , Rowland Heights - TV Repair
- Radiotelephone Communications, Rowland Heights
- Reading Instruction Schools, Rowland Heights
- Real Estate, Rowland Heights - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Rowland Heights
- Real Estate Appraiser, Rowland Heights - Appraisal Services
- Real Estate Appraisers & Consulting Services, Rowland Heights
- Real Estate Investment Trusts, Rowland Heights
- Real Estate Management, Rowland Heights
- Real Estate Properties, Rowland Heights
- Real Estate Property Investment Properties, Rowland Heights
- Real Estate Services, Rowland Heights
- Recreational Services, Rowland Heights
- Recycling Drop-Off Centers, Rowland Heights
- Recycling Scrap & Waste Materials, Rowland Heights - Scrap Metal, etc
- Religious Goods & Church Supplies Stores, Rowland Heights
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- Religious Organizations, Rowland Heights
- Repair Services, Rowland Heights
- Research Services, Rowland Heights
- Residential, Rowland Heights
- Residential Apartments, Rowland Heights
- Resorts & Hotels, Rowland Heights
- Rest Homes Information & Replacement Bureaus, Rowland Heights
- Restaurant & Lounge, Bar, Or Pub, Rowland Heights
- Restaurant Equipment Repair & Service, Rowland Heights - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants - Breakfast Brunch Lunch, Rowland Heights
- Restaurants/Food & Dining, Rowland Heights
- Rigging Service & Crane Hoisting, Rowland Heights
- Roofing Consultants, Rowland Heights - Roofing Companies
- Roofing Contractors, Rowland Heights - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Rowland Heights
- RV Repair, Rowland Heights - Recreational Vehicle
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