- Race Car Manufacturers, Houston
- Race Track Equipment & Supplies, Houston
- Racing Car Supplies, Houston
- Racing Engines, Houston
- Racing Including Track Operations, Houston
- Rackets Restringing & Repair, Houston
- Radar Equipment & Supplies, Houston
- Radiator Coolant & Solvents, Houston - Engine Coolant
- Radiator Repair, Houston - Gas Tank Repair
- Radiator Repair & Rebuild, Houston
- Radiator Repair - Auto & Industrial, Houston
- Radiators Heating, Houston
- Radio & Television Repair Shops , Houston - TV Repair
- Radio & Tv Communications Equipment Manufacturers, Houston
- Radio Broadcasting Consultants, Houston
- Radio Broadcasting Program Producers, Houston
- Radio Communications Equipment & Systems , Houston
- Radio Communications Equipment Service & Repair, Houston
- Radio Station Equipment & Systems, Houston
- Radio Stations & Broadcast Companies, Houston - Radio, Television & Publishers Representatives
- Radio Stations & Broadcasting Companies, Houston
- Radioactivity Detection Devices, Houston
- Radiologists, Houston - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Houston - X-Ray Equipment & Supplies
- Radiotelephone Communications, Houston
- Radon Testing & Services, Houston
- Railroad, Houston - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Houston
- Railroad Car Repair & Maintenance, Houston
- Railroad Cars Manufacturers, Houston
- Railroad Companies, Houston
- Railroad Contractors, Houston
- Railroad Equipment, Houston
- Railroad Equipment & Supplies Manufacturers, Houston
- Railroad Repair & Maintenance, Houston
- Railroad Services, Houston
- Railroad Ties, Houston
- Rain Gutters & Downspouts, Houston
- Range & Oven Repair, Service & Sales, Houston
- Rape Victim Services, Houston
- Reading Instruction Schools, Houston
- Ready Mix Concrete, Houston - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Houston
- Real Estate, Houston - Agent, Broker & Companies
- Real Estate & Insurance Schools, Houston
- Real Estate & Property Brokers, Houston
- Real Estate Agencies, Houston
- Real Estate Agent & Broker Services, Houston
- Real Estate Agent - Property Lessors, Houston
- Real Estate Appraiser, Houston - Appraisal Services
- Real Estate Appraisers & Consulting Services, Houston
- Real Estate Attorneys & Lawyers, Houston
- Real Estate Attorneys & Lawyers, Houston
- Real Estate Auctioneers, Houston
- Real Estate Broker, Houston
- Real Estate Consultants, Houston
- Real Estate Developers, Houston
- Real Estate Inspectors, Houston - Real Estate Inspection Service
- Real Estate Investment Trusts, Houston
- Real Estate Lawyers & Attorneys, Houston
- Real Estate Listings Services, Houston
- Real Estate Management, Houston
- Real Estate Office Buildings Warehouses & Factories, Houston
- Real Estate Properties, Houston
- Real Estate Property Investment Properties, Houston
- Real Estate Referral & Information Services, Houston
- Real Estate Rentals, Houston
- Real Estate Services, Houston
- Real Estate Services Franchises, Houston
- Real Estate Support Services, Houston
- Record Destruction Service, Houston
- Record Labels, Houston - Record Companies
- Record Storage, Destruction & Management, Houston
- Recording Instruments Industrial & Scientific, Houston
- Recording Studio - Equipment & Rental, Houston
- Recording Studio Equipment, Houston
- Recording Studio Service - Sound & Video, Houston
- Records Management Consultants, Houston
- Records, Tapes, Cd & Dvd Manufacturers, Houston
- Records, Tapes, CDs - Used & Vintage, Houston
- Records, Tapes, Compact Discs Wholesale, Houston
- Recreation Management Services, Houston
- Recreational Equipment & Supplies Companies, Houston
- Recreational Equipment Repair & Service, Houston
- Recreational Good Manufacturers, Houston
- Recreational Organizations, Houston
- Recreational Services, Houston
- Recreational Vehicles & Campers Rent & Lease, Houston
- Recycling & Sanitation Consultants, Houston
- Recycling Drop-Off Centers, Houston
- Recycling Pick Up Services, Houston
- Recycling Scrap & Waste Materials, Houston - Scrap Metal, etc
- Red Wing Shoes, Houston
- Reducing Exercise & Weight Control Services, Houston
- Refiners & Smelters Metals, Houston
- Refinery Equipment, Houston
- Reflexologists, Houston
- Reformed Churches, Houston
- Refrigerated Beverage Dispenser, Houston - Water Coolers Equipment & Supplies
- Refrigerated Storage & Warehouse, Houston - Warehousing
- Refrigerated Truck, Houston
- Refrigeration & Air Conditioning Contractors, Houston - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Houston - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Houston - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Houston
- Refrigerator Sales, Service & Repair, Houston - Fridge
- Refuse Collection & Disposal, Houston
- Refuse Collection & Disposal Services, Houston
- Refuse Systems & Garbage Disposal, Houston
- Rehabilitation Centers, Houston
- Rehabilitation Centers, Products & Services, Houston
- Rehabilitation Specialists, Houston
- Rehabilitational Job Training Services, Houston
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- Relaxation Therapy, Houston
- Relief Organizations, Houston
- Religious Counseling, Houston
- Religious Education, Houston
- Religious Goods & Church Supplies Stores, Houston
- Religious Organizations, Houston
- Religious Practitioners, Houston
- Religious Services, Houston
- Relocation Services, Houston
- Rendering Companies, Houston
- Rental & Leasing Business Equipment, Houston
- Rental Property Management, Houston
- Rental Services, Houston
- Repair Services, Houston
- Repossession Services, Houston
- Reprographic Services, Houston
- Reptiles, Houston
- Research & Development Bureaus, Houston - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Houston - Laboratories
- Research Clinics, Houston
- Research Film Laboratories & Film Services Motion Pictures, Houston
- Research Service Libraries, Houston
- Research Services, Houston
- Residential, Houston
- Residential Apartments, Houston
- Residential Architect, Houston
- Residential Architectural Designers, Houston
- Residential Care Facilities, Houston
- Residential Construction Contractors, Houston - General Contractors
- Residential Electricians, Houston - Electric Contractors
- Residential Landfills, Houston
- Residential Lighting Fixtures Manufacturers, Houston
- Residential Real Estate - Rental & Leasing, Houston
- Residential Real Estate Companies, Houston
- Resins Wholesale & Retail, Houston - Plastic Raw Materials
- Resorts & Hotels, Houston
- Resource Centers, Houston
- Respiratory Medical Services, Houston
- Respiratory Therapy, Houston
- Restaurant & Food Service Management Services, Houston
- Restaurant & Lounge, Bar, Or Pub, Houston
- Restaurant Architects, Houston
- Restaurant Equipment, Houston
- Restaurant Equipment & Supplies, Houston
- Restaurant Equipment & Supplies Manufacturers, Houston
- Restaurant Equipment Cleaning, Houston - Restaurant Cleaners
- Restaurant Equipment Leasing & Rental, Houston
- Restaurant Equipment Repair & Service, Houston - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, Houston
- Restaurant Management & Consulting, Houston - Food Facilities Consultants
- Restaurant Supplies & Equipment, Houston
- Restaurants - Breakfast Brunch Lunch, Houston
- Restaurants/Food & Dining, Houston
- Restoration Church, Houston
- Restoration Contractors, Houston
- Restroom Equipment, Houston
- Resume Service, Houston
- Retail Book Stores, Houston
- Retaining Wall Contractors, Houston - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Houston
- Retirement Communities & Home, Assisted Living & Apartments, Houston
- Retirement Homes, Houston
- Retirement Planning Consultants & Services, Houston
- Retreat Facilities & Houses, Houston
- Reweavers Garment Services, Houston
- Rheem / Rudd Heating & Air Conditioning Contractors, Houston - Air Conditioner Contractors & Systems
- Rhema Church, Houston
- Rheumatologists, Houston - Rheumatology Doctors, Physicians & Surgeons
- Rice Products, Houston
- Ride Share Information, Houston
- Riding & Rodeo Services, Houston
- Riding Apparel & Equipment, Houston
- Riding Equipment, Houston
- Rifle & Pistol Ranges, Houston
- Rigging Equipment & Supplies, Houston
- Rigging Service & Crane Hoisting, Houston
- Right Of Way Acquisition Contractors, Houston
- Risk Management Consultants, Houston
- Road Boring Contractors, Houston
- Road Boring Contractors, Houston
- Road Construction, Houston - Companies & Contractors
- Road Construction & Repair Contractors, Houston
- Road Construction Equipment & Machinery, Houston
- Roadside Assistance, Road Service & Towing Service, Houston
- Robots & Robotics System, Houston
- Rock Shops, Houston
- Rodeo & Equestrian Equipment & Supplies, Houston
- Rodeo Producers & Companies, Houston
- Rods, Springs & Suspension Equipment & Supplies, Houston
- Roller Skating Rinks, Houston
- Roofing & Siding Materials, Equipments & Supplies, Houston - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Houston - Roofing Companies
- Roofing Contractors, Houston - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Houston
- Room Dividers, Houston - Room Partitions Contractors
- Rooming & Boarding Houses, Houston
- Royalties Oil & Mineral, Houston
- Rubber Compounding & Mixing, Houston
- Rubber Crude, Houston
- Rubber Products, Houston
- Rubber Products - Manufacturers, Houston
- Rubber Products - Retail, Houston
- Rubber Reclaiming, Houston
- Rubber Stamps, Houston
- Rust Preventives, Houston
- RV & Campers Repair & Service, Houston
- Rv Parks, Houston
- RV Parts, Accessories & Equipment, Houston - ATV & Recreation Vehicles
- RV Repair, Houston - Recreational Vehicle
- RV Repair & Service, Houston - ATV & Recreation Vehicles
- Rvs Sales, Rental & Leasing, Houston
- Ryder Truck Rental , Houston - Ryder Moving
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