- Sabotage Prevention Services, Houston
- Safe & Vault, Houston
- Safe, Lock & Key Repair Services, Houston - Safes & Vaults Opening & Repair
- Safes & Vaults Movers, Houston
- Safety & Security Contractors, Houston
- Safety & Security Services, Houston
- Safety & Security Systems & Consultants, Houston
- Safety Equipment & Clothing Manufacturers, Houston
- Safety Equipment & Supplies, Houston
- Safety Training Schools, Houston
- Sails, Houston
- Sales & Marketing Consultant, Houston
- Sales Promotion & Counseling Service, Houston
- Salted & Roasted Nuts & Seeds Manufacturers, Houston
- Salvage Disposal Service, Houston
- Salvage Yards, Houston - Auto, Motorcycle, Boat, Trucks, etc
- Salvage Yards, Junk Yards & Wrecker Service, Houston
- Salvation Army, Houston
- Sand Gravel & Aggregate, Houston
- Sandblasting, Houston - General Contractors
- Sandblasting Equipment & Supplies, Houston
- Sandwich Shop Restaurants, Houston
- Satellite & Cable TV Equipment & Systems Repair & Service, Houston
- Satellite Communication Downlinking & Uplinking, Houston
- Satellite Descrambling & Programming Service, Houston
- Satellite Dish Antennas & Equipment Dealers, Houston
- Satellite Technology & Space Research, Houston
- Satellite TV Service, Houston
- Savings & Loan Associations, Houston
- Savings Banks, Houston
- Sawmill & Planing Mills, Houston
- Sawmill Supplies & Equipment Repair, Houston
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Houston
- Saws Commercial & Industrial, Houston
- Scaffolding & Aerial Lifts, Houston
- Scales Public, Houston
- Scales Rental & Leasing, Houston
- Scales Retail, Houston
- Scales Weighing Service, Houston
- Scalp Treatments & Products, Houston
- Scanners & Digitizing Equipment & Supplies, Houston
- Scanning Service, Houston
- Scholarships Grants & Financial Assistance Information, Houston
- School - Catholic, Houston
- School - Christian, Houston
- School Bus Transportation Service, Houston
- School Furniture Manufacturers, Houston
- Schools - Online, Houston
- Schools For The Deaf, Houston
- Schools For The Physically Challenged, Houston
- Schools Montessori Instruction, Houston
- Science & Academic Consultants, Houston
- Science & Medical Equipment, Houston
- Science & Research, Houston
- Scientific & Laboratory Equipment & Instruments, Houston
- Scientific & Research Professionals, Houston
- Scientific Equipment & Services, Houston
- Scientific Equipment & Supplies, Houston
- Scientific Services, Houston
- Scientific Services, Houston
- Scientology Churches, Houston
- Scouting Supplies & Uniforms, Houston
- Scrap & Waste Machinery, Houston
- Scrap & Waste Materials, Houston
- Scrapbooks & Scrapbook Supplies, Houston
- Screen Houses, Houston
- Screen Printing, Houston
- Screen Printing Supplies & Equipment, Houston
- Screens Doors & Windows, Houston
- Sculptures Retail, Houston
- Seafood Restaurants, Houston
- Sealing Compounds, Houston
- Seals, Houston - Hermetic, Hydraulic, Mechanical, Metal, Oil, Grease, etc
- Seals Hermetic Manufacturers, Houston
- Seals Notary & Corporation, Houston
- Seals O Ring, Houston
- Search & Navigation Equipment Manufacturers, Houston
- Seawall & Shoring Contractors, Houston
- Secondary Schools, Houston
- Secretarial & Court Reporting Services, Houston
- Secretarial School, Houston
- Security & Commodity Brokers, Houston
- Security & Commodity Exchanges, Houston
- Security & Surveillance System & Equipment, Houston
- Security Alarm Systems - Home & Business, Houston
- Security Brokers & Dealers, Houston
- Security Consultants, Houston
- Security Control Systems & Monitoring, Houston - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Houston - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Houston
- Security Services, Houston
- Seed & Grain Cleaning, Houston
- Seismic Data Brokers, Houston
- Seismographic Service, Houston
- Self Defense Programs, Houston
- Semi Precious Metals, Houston
- Semiconductors & Equipment, Houston
- Senators Elected, Houston
- Senior Citizen Counseling, Houston
- Senior Citizens Housing, Houston
- Senior Citizens Information & Services, Houston
- Senior Citizens Service & Health Organizations, Houston
- Septic Tank Installation & Repair, Houston - Septic Systems
- Septic Tank Pumping & Cleaning, Houston - Septic Systems
- Septic Tanks & Septic Systems Contractors, Houston - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Houston - Wholesale, Dealers & Suppliers
- Service & Gas Station Equipment & Services, Houston
- Service Establishment Supplies & Equipment, Houston
- Service Industry Manufacturers Machinery, Houston
- Service Station Equipment - Installation, Repair & Maintenance, Houston
- Settlement Companies, Houston
- Sewage Plant Operation, Houston
- Sewage Septic Service, Houston
- Sewer & Drain Cleaning & Repair, Houston - Drain Cleaner & Installation Services
- Sewer Cleaning Equipment & Supplies, Houston - Sewer Builders
- Sewer Companies, Houston
- Sewer Construction Contractors, Houston - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Houston
- Sewing Contractors, Houston
- Sewing Machine Repair & Service, Houston
- Sewing Machines, Equipment & Supplies, Houston
- Sewing Ribbons, Houston
- Sewing Spindles, Houston
- Sewing Thread, Houston
- Sharpening Service, Houston
- Sheet Metal, Houston
- Sheet Metal Contractors, Houston - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Houston
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Houston - Sheet Metal Products
- Sheet Metal Work Industrial Manufacturers, Houston
- Shelving & Shelves, Houston - Metal, Steel, Wire & Glass Shelving Units & Storage - Wall Shelves
- Shelving Equipment, Houston
- Sheriff's Department, Houston
- Shims, Houston
- Ship & Boat Building & Repairing, Houston
- Ship & Yacht Broker & Agent, Houston
- Ship Chandlers, Houston
- Ship Fueling, Houston
- Ship Management, Houston
- Shipping Companies, Houston
- Shipping Service, Houston
- Shipping Systems Computerized, Houston
- Shipping Terminals, Houston
- Shipyards, Houston
- Shirts & T-Shirts, Houston
- Shirts Wholesale & Retail, Houston
- Shock Absorber, Houston
- Shock Absorbers & Struts, Houston
- Shoe Dyers, Houston
- Shoe Repair Shops, Houston
- Shoe Repair Supplies & Equipment, Houston
- Shoe Shining, Houston
- Shoe Store - More, Houston
- Shoe Stores, Houston - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Houston
- Shoppers News Publications, Houston
- Shopping & Shopping Services, Houston
- Shopping Services, Houston
- Shoring Contractors, Houston
- Short Term Business Credit Institutions, Houston
- Shot Peening, Houston
- Shutters - Interior & Exterior, Houston - Wood, Vinyl, Window, Plantation Shutters, etc
- Sidewalk Cafes, Houston
- Siding Contractors, Houston - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Siding Materials, Houston
- Sightseeing Tours, Houston
- Sign Equipment & Supplies, Houston
- Sign Hanging & Installation Service, Houston - Signs Erectors & Hangers
- Sign Lettering & Painting Services, Houston
- Sign Products & Services, Houston
- Sign Supplies & Sign Making Equipment, Houston
- Signs, Houston
- Signs & Advertising Specialties Manufacturers, Houston
- Signs Magnetic, Houston
- Sikh Church, Houston
- Silencers Industrial, Houston
- Silica Minerals & Ores, Houston
- Silk Flowers & Plants Rental & Leasing, Houston
- Sitting Services, Houston
- Skateboards & Equipment Shops, Houston - Skateboarding Supplies
- Skating Rink & Hockey Operation Services, Houston
- Skating Supplies, Houston - Ice, Inline, Speed, Figure & Roller Skates
- Ski & Snowboard Instructions, Houston
- Ski Equipment & Supplies Shops, Houston - Skiing Helmets, Goggles, Clothes, Boots, Gear & Accessories
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Houston
- Skin Care & Cosmetology Salons, Houston
- Skin Care Products & Treatments, Houston
- Skylights, Houston - Skylight Shades, Blinds, Covers & More
- Sleds, Snowboards & Snowshoes Shops, Houston - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Sleep Disorders Treatment & Information Centers, Houston
- Sleep Doctors, Houston - Specialists, Physicians & Surgeons (Sleep Medicine)
- Slides & Film Strips, Houston
- Small Appliances, Houston
- Small Business & Office Equipment Repair Services, Houston
- Smelters & Refiners Base Metals, Houston
- Smelters & Refiners Precious Metals, Houston
- Smog Check, Brake & Lamp Inspection & Repair, Houston
- Smoke Abatement Equipment, Houston
- Smoke Odor Counteracting Services, Houston
- Smoked Meat Restaurants, Houston
- Smoking Cessation Treatment Centers & Information Services, Houston
- Smoothie Restaurants, Houston
- Snack Foods, Houston
- Snacks & Desserts, Houston
- Snow Cone Stands, Houston
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- Snow Cones, Houston
- Soaps & Cosmetics, Houston
- Soccer Clubs, Houston
- Soccer Equipment & Supplies, Houston
- Soccer Facilities, Houston
- Social Clubs & Organizations, Houston
- Social Security And Disability Attorneys & Lawyers, Houston
- Social Security And Disability Lawyers & Attorneys, Houston
- Social Security Counselors & Representatives, Houston
- Social Service Organizations Volunteer Services, Houston
- Social Service Organizations Womens Services, Houston
- Social Services & Welfare, Houston
- Social Workers & Services, Houston
- Societies & Foundation Associations, Houston
- Sod & Sodding Service, Houston
- Soda Fountain Shops, Houston
- Softball Clubs, Houston
- Soil Scientists, Houston
- Soil Testing Labs, Houston - Concrete Testing
- Solar Energy Companies - Contractors, Houston - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, Houston - Solar Power Systems
- Solar Energy Equipment - Installation & Repair, Houston
- Solar Equipment, Houston
- Solar Products & Services, Houston
- Solariums & Garden Rooms, Houston
- Sororities, Houston
- Soul Food Restaurants, Houston
- Sound Systems & Recording Equipment, Houston
- Sound Systems, Microphones & Equipment, Houston
- Soup & Salad Restaurants, Houston
- South American Restaurants, Houston
- Southern Style Restaurants, Houston
- Souvenirs & Favours, Houston
- Soybean Production, Houston
- Spanish Restaurants, Houston
- Spanish Speaking Churches, Houston
- Spare Rib Restaurants, Houston
- Speaker Equipment, Houston
- Special Coatings, Houston - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, Houston
- Special Education & Care, Houston
- Special Events & Party Supply Rental, Houston
- Special Events Photographers, Houston
- Special Interest Schools Or Instruction, Houston
- Special Needs Transportation, Houston
- Speciality Food Stores, Houston
- Specialty Animal Services, Houston
- Specialty Communication Companies & Services, Houston
- Specialty Flooring, Houston
- Specialty Goods Storage, Houston
- Specialty Rental Services, Houston
- Specialty Stores, Houston
- Specialty Vehicle Rental & Leasing, Houston
- Speech & Hearing Specialists, Houston
- Speech & Language Therapy, Houston
- Speech Aid Devices, Houston
- Speech Pathologists, Houston - Speech & Language Therapy
- Speed Reducers, Houston
- Spiritual Church, Houston
- Sporting & Recreational Camps, Houston
- Sporting Goods - Other, Houston
- Sporting Goods Equipment Rental, Houston
- Sporting Goods Manufacturers, Houston
- Sporting Goods Stores, Houston
- Sports & Recreational Services, Houston
- Sports Agents, Houston
- Sports Bars & Lounges, Houston
- Sports Clubs, Houston
- Sports Consultants, Houston
- Sports Information Services, Houston
- Sports Massage, Houston
- Sports Medicine, Houston - Doctors, Physicians & Surgeons
- Sports Officiating Services, Houston
- Sports Promoters & Managers, Houston
- Sports Promotions & Special Events, Houston
- Sports Schools & Training Camps, Houston
- Sports Teams & Franchises, Houston
- Sports Utility Vehicle Parts & Service, Houston
- Sportswear Clothing Stores, Houston - Sports Clothes
- Sportswear Manufacturers, Houston
- Sportswear Wholesale, Houston
- Spray Painting & Finishing, Houston - Plastic, Furniture, Acrylic, Wood & Metal
- Spraying & Dusting Equipment Manufacturers, Houston
- Spraying Booths & Equipment, Houston
- Spraying Equipment Manufacturers, Houston
- Springs Automotive, Houston
- Springs Coil Flat - Industrial Supply & Equipment, Houston
- Springs Coil Flat Etcetera Manufacturers, Houston
- Sprinkler Alarm Systems, Houston - Fire Sprinkler Systems
- Sprinkler Supervisory Service, Houston
- Sprinkler System Contractors, Houston - Garden & Lawn Sprinkler System Installation & Repair
- Square Dance Apparel, Houston
- Stadiums, Arenas, Coliseums & Athletic Fields, Houston
- Staffing & Support Services, Houston
- Stainless Steel, Houston
- Staircases Stairs & Railings, Houston
- Stamp Collecting & Coin Dealers , Houston
- Staples Staplers & Tackers, Houston
- State Administrative Agencies, Houston
- State Government, Houston
- State Legislators, Houston
- Stationery & Office Supplies, Houston
- Stationery Engravers, Houston
- Stationery Manufacturers, Houston
- Steak House Restaurants, Houston
- Steam Bath Equipment & Supplies, Houston
- Steam Cleaner - Commercial & Industrial, Houston - Steam Cleaning - Upholstery, Floor, Carpet, etc
- Steam Cleaning Equipment Rental & Leasing, Houston
- Steam Cleaning Residential, Houston
- Steamship Companies & Agencies, Houston
- Steel & Brass Stamps Manufacturers, Houston
- Steel & Metal Goods, Houston - Steel Distributors
- Steel Bar Sheet Strip Tube Etcetera Manufacturers, Houston
- Steel Detailers, Houston
- Steel Erection Contractors, Houston - Steel Erectors
- Steel Fabrications Flamecutting, Houston
- Steel Fabrications Specialties, Houston
- Steel Manufacturers, Houston
- Steel Mills & Blast Furnaces, Houston
- Steel Pipe, Houston
- Steel Pipes & Tubes Manufacturers, Houston
- Steel Products, Houston
- Steel Reinforcing Supplies, Houston
- Steel Springs Manufacturers Except Wire, Houston
- Steel Tool & Alloy, Houston
- Steel Used, Houston
- Steel Work Contractors, Houston
- Steering Column Repair & Services, Houston
- Stereo Audio & Video Equipment, Houston
- Stereo Audio & Video Equipment Manufacturers, Houston
- Stereo, Audio & Video Equipment Dealers & Stores, Houston
- Stevedoring Contractors, Houston
- Stitching Services, Houston
- Stock & Bond Brokers & Dealers, Houston
- Stocks & Bond Brokers, Houston
- Stone, Houston
- Stone And Glass Products, Houston
- Stone Cleaning & Restoration, Houston
- Stone Patching Materials, Houston
- Stone Refinishing Restoration & Cleaning, Houston
- Stone Setting Contractors, Houston
- Storage & Closet Equipment Supplies & Materials, Houston
- Storage Batteries Manufacturers, Houston
- Storage Containers, Houston
- Storage Trailers & Containers, Houston
- Store Designers & Planners, Houston
- Store Fixtures, Houston
- Store Fixtures & Display Equipment, Houston
- Store Fronts, Houston - Storefront
- Storm Doors & Windows, Houston
- Storm Shelter Contractors, Houston
- Stove, Oven, Range & Cooktop Parts & Supplies, Houston
- Stoves & Furnace Equipment, Houston - Fittings & Repair Parts
- Stoves, Ovens, Ranges & Cooktops, Houston
- Strapping & Strapping Equipment, Houston
- Stress Management & Counseling, Houston
- Stripers Mechanical, Houston
- Structural Engineer, Houston
- Structural Steel Erection, Houston
- Stucco Siding Contractors, Houston - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Houston
- Stucco Stone, Houston
- Student Housing & Services, Houston
- Submarine Sandwich Restaurants, Houston
- Substance Abuse Clinics, Houston - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Outpatient Clinics, Houston
- Sugar Refiners, Houston
- Suicide Prevention Service & Counseling, Houston
- Sulphur Mining, Houston
- Summer Camps, Houston
- Sun Glasses & Sun Goggles Manufacturers, Houston
- Sunglasses & Goggles, Houston
- Sunrooms & Solarium Construction Contractors, Houston - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, Houston - Build & Repair
- Support Services, Houston
- Surfboard & Windsurfing Equipment Shops, Houston
- Surge Protection Equipment, Houston
- Surgical Hospitals, Houston - Surgical Centers
- Surgical Supplies & Equipment, Houston
- Surgical Supplies, Instruments, Tools & Equipment, Houston
- Surplus & Salvage Merchandise, Houston
- Surveying Engineer, Houston
- Surveyor Services, Houston - Surveying Service
- Surveyors, Houston
- Surveyors Cargo, Houston
- Sushi Restaurants, Houston
- Sweepers & Scrubbers Industrial, Houston - Sweeping Service
- Sweepers & Scrubbers Power, Houston
- Swimming, Houston
- Swimming Lessons & Classes, Houston
- Swimming Pool Designing & Consulting, Houston
- Swimming Pool Remodeling & Renovation, Houston
- Swimming Pool, Sauna & Spa Contractors, Houston
- Swimming Pools, Houston
- Swimming Pools & Equipment Manufacturers, Houston
- Swimming Pools Contractors, Houston - Install Inground - Above Ground Pools
- Swimming Pools Coping Plastering & Tiling, Houston
- Swimming Pools Management Services, Houston
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Houston
- Swimming Pools Supplies, Equipment & Accessories, Houston
- Swimwear & Accessories Shops, Houston - Water Sports Equipment
- Swiss Restaurants, Houston
- Synagogues & Temples, Houston
- Synthetic & Blended Fabrics Manufacturers, Houston
- Synthetic Resins & Rubber, Houston
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