- T-Shirt Manufacturers, Houston
- Table Tennis Facilities, Houston
- Tables Retail, Houston - Tabletops
- Tachometers & Tachographs, Houston
- Tags, Tickets, Coupons & Menu Printing Lithographic, Houston
- Tailoring Trade School, Houston
- Talent Agencies & Casting Services, Houston
- Talent Agents & Managers, Houston
- Tank & Pipe Contractors, Houston
- Tank & Pipe Working Industrial Equipment, Houston
- Tank Cars, Houston
- Tank Cleaning & Draining , Houston
- Tank Testing & Inspection, Houston
- Tanks - Fiberglass, Rubber, Plastic, Etc, Houston
- Tanks Equipment, Houston
- Tanks Installation, Repair & Removal, Houston - Water, Fuel & Septic Tank
- Tanks Underground Storage, Houston
- Tanning Salons, Houston
- Tapas Bars, Houston
- Tape Recorders, Houston
- Tapes Sound & Video, Houston
- Tapestries Retail, Houston
- Tarps, Houston - Tarpaulins
- Tattoo & Piercing Equipment & Supplies, Houston
- Tattoo Covering & Removing, Houston
- Tattooing, Houston
- Tax Attorneys & Lawyers, Houston
- Tax Attorneys & Lawyers, Houston
- Tax Consultants, Houston
- Tax Lawyers & Attorneys, Houston
- Tax Preparations Electronic Filings, Houston
- Tax Reporting Services, Houston
- Tax Return Preparation, Houston
- Tax Services, Houston
- Taxi Cab Service, Houston
- Taxi Service, Houston
- Taxidermists, Houston - Taxidermy
- Technical Consultants, Houston
- Technical Illustrations, Houston
- Technological Research & Development, Houston
- Technology Transfer Consultants, Houston
- Teeth Whitening Products, Houston
- Teeth Whitening Products & Services, Houston
- Telecommunications, Houston
- Telecommunications Companies, Businesses & Services, Houston
- Telecommunications Consultants, Houston
- Telecommunications Contractors, Houston
- Telecommunications Management Services, Houston
- Teleconference Service, Equipment & Systems, Houston
- Telegraph Companies & Services, Houston
- Telemarketing Equipment, Houston
- Telemarketing Services, Houston
- Telephone Answering & Secretarial Service, Houston
- Telephone Answering Service, Houston - Messenger Services
- Telephone Answering Service Referrals, Houston
- Telephone Apparatus, Houston
- Telephone Communication Service & Phone Companies, Houston - Local & Long Distance Telephone Service
- Telephone Directory Publishers, Houston - Publishers - Directory & Guide
- Telephone Equipment & Phone Systems, Houston - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Houston - Telecommunication Services
- Telephone Wire & TV Cable Contractors, Houston - Phone Jack - Wiring Installation
- Telephones On Hold Audio Services, Houston
- Telescope Equipment, Houston
- Television Equipment & Systems Dealers, Houston
- Television Program Producers Services & Supplies, Houston
- Television Programs Producers & Distributors, Houston
- Television Stores & Dealers, Houston
- Television Systems - Closed Circuit Telecasting, Houston - CCTV
- Temp Agencies, Houston
- Temperature Controlled Containers, Houston
- Temperature Measuring Materials, Houston
- Temporary & Contractor Agencies, Houston
- Tennis Clubs, Houston
- Tennis Court Construction, Houston - Resurfacing & Repair
- Tennis Courts, Houston
- Tennis Courts Enclosures, Houston
- Tennis Equipment & Supplies Stores, Houston - Racquets, Shoes, Balls, Bags, Clothing & Accessories
- Tennis Lessons, Houston - Includes Badminton Coaching
- Tent Rentals, Houston
- Tents, Canopies & Awnings, Houston
- Terrazzo Contractors, Houston
- Terrazzo Tile Marble & Mosaic Contractors, Houston
- Testing Calibration & Gauge Testing Labs, Houston
- Testing Laboratories, Houston - Lab Tests
- Tex Mex Restaurants, Houston
- Textile Machinery, Supplies & Equipment, Houston - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Textile Manufacturers, Houston
- Textile Products - Wholesale & Retail, Houston
- Textiles & Textile Finishing, Houston
- Thai Restaurants, Houston
- Theater & Sport Ticket Agencies, Houston
- Theater Companies & Brokers, Houston - Stage Theatres, Concert Halls, Auditoriums, Ballrooms & Venues
- Theaters Design Consultants, Houston
- Theatrical Costume Scenery Design Services, Houston
- Theatrical Managers & Producers, Houston
- Theatrical Producers & Services, Houston
- Theme & Entertainment Restaurants, Houston
- Theological Schools, Houston
- Therapists & Therapy Services, Houston
- Thermoelectric Equipment, Houston
- Thermography Equipment & Inspection Services, Houston
- Thoracic Surgeons, Houston - Thoracic Surgery Doctors & Physicians
- Thread Rolling Cutting & Grinding Equipment & Supplies, Houston
- Thrift Stores, Resale & Consignment Shops, Houston
- Tile & Floor Repair Services, Houston
- Tile & Mosaics, Houston - Manufacturers & Distributors
- Tile Contractors - Install & Repair, Houston - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Tile Flooring, Houston
- Tile Supplies, Houston - Tile Stores - Companies
- Timberland & Timberland Companies, Houston
- Time & Temperature, Houston
- Time Clocks & Recorders, Houston
- Time Recorders & Supplies, Houston - Time Cards Racks
- Tire Disposal, Houston
- Tire Repair, Recapping & Retread, Houston
- Tire Retread, Regroove & Repair Equipment, Houston
- Tires - Wholesale & Retail, Houston
- Tires Recycling, Houston
- Titanium Metals, Houston
- Title & Surety Insurance, Houston
- Title Companies, Houston - Title Search, Service & Abstract Company
- Title Service, Houston
- Tobacco Products, Houston
- Toner Cartridges Refurbishing Services, Houston
- Toning Salons, Houston
- Tool & Die Makers, Houston
- Tool & Machine Designers, Houston
- Tool Repair & Parts, Houston
- Tool Repair & Service, Houston
- Tools & Hardware Supplies, Houston
- Tools Reels, Houston
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- Tourist Attractions, Houston
- Tourists Information & Attractions, Houston
- Tours & Guide Services, Houston
- Tower & Power Line Contractors, Houston
- Towers Buildings & Antennas, Houston
- Towers Communications, Houston
- Towing Service, Houston
- Toxic Or Hazardous Waste Spill Cleanup, Houston
- Toxicologists, Houston
- Toxicology Testing Labs, Houston
- Toy Models Manufacturers, Houston
- Toy Repair, Houston
- Toy Stores, Houston
- Toyota Dealers, Houston
- Tracing Bureaus, Houston
- Tractor Rental & Leasing, Houston
- Tractor Repair & Service, Houston
- Tractors Equipment & Supplies, Houston
- Trade & Business Publications, Houston
- Trade Clearing Exchanges, Houston
- Trade Show Exhibits, Houston
- Trade Shows, Expositions & Fairs, Houston
- Trademark Development & Searching, Houston
- Trading Cards, Houston
- Trading Cards Non Sports, Houston
- Trading Posts, Houston
- Traffic & Parking Consultants, Houston
- Traffic Signs, Signals & Equipment , Houston
- Traffic Ticket Attorneys & Lawyers, Houston - Traffic Violation
- Traffic Ticket Lawyers & Attorneys, Houston - Traffic Violation
- Traffic Violation Attorneys & Lawyers, Houston - Traffic Ticket
- Trailer Hitch, Houston - Accessories, Parts, Installation, etc
- Trailer Parks & Campsites, Houston
- Trailer Parts & Equipment, Houston
- Trailer Rental & Leasing, Houston
- Trailer Renting & Leasing Commercial & Industrial, Houston
- Trailer Repair, Houston - Travel, Utility, Cargo, Boat Trailer, etc
- Trailers & Trailer Equipment Manufacturers, Houston
- Trailers Automobile Utility Manufacturers, Houston
- Trailers Food & Concession, Houston
- Trailers Transporting, Houston
- Training & Seminars - Program Designing & Development, Houston
- Training Centers, Houston
- Training Consultants, Houston
- Training Consultants, Houston
- Training Programs Designing & Development, Houston - Training Consultants
- Trampoline Equipment, Houston
- Trampoline Instruction, Houston
- Trane Ge Air Conditioning, Houston - Air Conditioner Contractors & Systems
- Transcription Services, Houston
- Translators & Interpreters, Houston
- Translators & Interpreters Commercial Technical, Houston
- Translators Systems & Equipment, Houston
- Transmission Repair & Service, Houston
- Transplant Services, Houston
- Transplant Surgeons, Houston - Transplant Surgery Doctors & Physicians
- Transportation, Houston
- Transportation & Distribution Management, Houston
- Transportation & Traffic Consultants & Services, Houston - Transportation Brokers & Consultants
- Transportation Equipment, Houston
- Transportation Equipment And Supplies - Except Motor Vehicle, Houston
- Transportation Equipment Manufacturers, Houston
- Transportation Equipment, By Name, Houston
- Transportation Expeditors, Houston
- Transportation Facilities & Services, Houston
- Transportation For Handicapped & Elderly, Houston - Senior & Disabled
- Transportation Inspection Services, Houston
- Transportation Programs Ports Ships & Boats, Houston
- Transportation Rental & Leasing, Houston
- Transportation Repair & Maintenance, Houston
- Transportation Service Permit, Houston
- Trapping & Trapping Equipment, Houston
- Travel & Tourism, Houston
- Travel Arrangement & Services, Houston
- Travel Clubs & Services, Houston
- Travelers Checks, Houston
- Travelers Checks & Money Order Services, Houston
- Travels Health Counseling & Vaccinations, Houston
- Tree & Shrub Transplanting & Removal, Houston
- Tree Service Equipment, Houston
- Trees & Shrubs Retail, Houston
- Trench Boxes, Houston
- Trenching & Excavating Equipment Rental, Houston
- Trenching Contractors, Houston - Trencher - Excavation Contractors
- Trial & Litigation Attorneys & Lawyers, Houston
- Trial & Litigation Lawyers & Attorneys, Houston
- Trinity Church, Houston
- Triumph Church, Houston
- Tropical & Saltwater Fish Stores, Houston
- Tropical Foliage Service, Houston
- Truck & Tractor Transmission Repair, Houston
- Truck & Van Accessories & Customizing Supplies, Houston
- Truck Air Conditioning Repair, Parts, Equipment & Service, Houston
- Truck Alignments, Houston
- Truck Bedliners, Houston
- Truck Campers & Camper Shells, Houston - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Driver Leasing, Houston
- Truck Driving School, Houston
- Truck Lubricating Services, Houston
- Truck Parts & Equipment, Houston
- Truck Permit Service, Houston
- Truck Refrigeration Equipment & Repair, Houston
- Truck Rental & Leasing, Houston - Rent a Truck & Tractor
- Truck Repair & Service, Houston
- Truck Stops, Houston
- Truck Trailers Parts & Dealers, Houston
- Truck Wash & Cleaning Service, Houston
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Houston - Collection, Removal, Disposal, Recycling, etc
- Trucking Bureaus, Houston
- Trucking Consultants, Houston
- Trucking Petroleum Products, Houston
- Trucking Terminals, Houston
- Trust And Will Attorneys & Lawyers, Houston
- Trust And Will Lawyers & Attorneys, Houston
- Trust Companies, Houston
- Truth Church, Houston
- Tube Cleaning & Expanding Equipment, Houston
- Tube Fittings, Houston
- Tubing Metal, Houston
- Tubing Rubber & Plastic, Houston
- Tugboat & Towing Service, Houston
- Tungsten Products, Houston
- Tunneling Contractors, Houston
- Turbine Engine, Houston
- Turbochargers, Houston
- Turkish Restaurants, Houston
- Tutoring Instructor, Houston
- TV & Radio Advertising, Houston - TV Commercials, Radio Stations ads, etc
- TV Stations & Broadcasting Companies, Houston - Cable TV Networks, Talk Shows, etc
- Typing & Word Processing Services, Houston
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