- Gambling & Lottery Services, Houston
- Game & Wildlife Consultants, Houston
- Game Farms, Houston
- Games & Hobbies, Houston
- Games Toys & Childrens Vehicles Manufacturers, Houston
- Garage Building & Repair, Houston - Carports - Garage Builders
- Garage Door Repair, Houston
- Garage Doors & Door Operating Devices, Houston
- Garage Doors & Gates, Houston - Stores & Companies - Install & Repair Services
- Garage Doors & Openers Contractors, Houston
- Garage Organizers, Houston - Garage Storage Companies
- Garage, Door & Window Products, Houston
- Garbage & Rubbish Removal, Houston
- Garbage Disposal Equipment Repair & Service, Houston
- Garden & Lawn Sprinkler Repair, Installation & Service, Houston
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Houston
- Garment & Linen Services, Houston
- Garment Pressing & Cleaners Agents, Houston - Laundries & Dry Cleaners
- Gas & Air Compressors, Houston
- Gas Appliance Repair, Maintenance & Service, Houston
- Gas Chemicals, Houston
- Gas Companies, Houston
- Gas Compressed Natural, Houston
- Gas Detection, Asbestos & Lead Contractors, Houston
- Gas Detectors & Analyzing, Houston
- Gas Engine, Houston
- Gas Equipment & Supplies, Houston
- Gas Equipment & Supplies, Houston - Gas Piping
- Gas Equipment Industrial, Houston
- Gas Equipment Repair & Service, Houston
- Gas Line Installation Contractors, Houston - Gas Pipe Installation - Repair Service
- Gas Measurement Service, Houston
- Gas Pipelines, Houston
- Gas Piping Contractors, Houston - Gas Pipe Installation & Repair Service
- Gas Station, Houston - Service & Filling Station
- Gases, Houston
- Gasket, Houston - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gaskets Packing & Sealing Devices Manufacturers, Houston
- Gaskets Retail, Houston
- Gasoline, Houston
- Gastroenterologists, Houston - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gate & Fence Repair, Houston
- Gauges, Houston
- Gauges & Gages, Houston
- Gauges & Gages Repair, Houston
- Gavels, Houston
- Gay & Lesbian Service Organizations, Houston
- Gears, Houston
- Gears & Gear Cutting, Houston
- Gemologists & Jewelers, Houston
- Gemstone Jewelers, Houston
- Genealogy, Houston
- General Business Consulting, Houston
- General Business Services, Houston
- General Consultants, Houston
- General Freight Trucking, Houston - Motor Freight
- General Hardware Stores, Houston
- General Management Consultants & Services, Houston
- General Management Consulting Services, Houston - Management Consultants
- General Merchandise Stores, Houston
- General Surgeons, Houston - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Houston
- Generator Manufacturers, Houston
- Generator Rental & Leasing, Houston
- Generator Repair, Houston
- Generator Sales & Rental, Houston - Contractors Supplies & Equipment
- Generators, Houston - Solar, Steam, Wind Power, etc
- Generators, Compressors, Pumps, Motors & Fans, Houston
- Genetic Testing Labs, Houston
- Geophysical Research, Houston
- Geotextiles Tiles, Houston
- Geothermal Heating & Cooling Contractors, Houston - Geothermal HVAC - Installation
- Geriatricians, Houston - Geriatric Specialists, Doctors, Physicians & Surgeons
- Gift Baskets, Houston
- Gift Novelty & Card Manufacturers, Houston
- Gift Shops, Houston - Gift, Novelty & Souvenir Stores
- Gift Wares Mmanufacturers, Houston
- Gift Wrapping Materials, Houston
- Gifts By Type & Occasion, Houston
- Gifts Corporate, Houston
- Gifts Wholesale & Retail, Houston
- Gifts, Cards & Stationery Stores, Houston
- Glass, Houston
- Glass & Fiber Glass Materials, Houston - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Houston
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- Glass & Glazing Contractors, Houston
- Glass - Auto, Float, Plate, Window & Doors, Houston
- Glass - Beveled, Carved, Etched & Ornamental, Houston
- Glass Block & Architectural, Houston
- Glass Broken, Houston
- Glass Furniture Tops, Houston
- Glass Plate Windows, Houston
- Glass Products Manufacturers, Houston
- Glass Repair, Houston - Car, Window, Auto Glass Repair
- Glass Scientific & Technical, Houston
- Glass Stained & Leaded, Houston
- Glass Tinting & Coating, Houston - Home - Car Window Tinting
- Glazing Contractors, Houston - Glass - Window Glazing
- Gliders & Sailplanes, Houston
- Gloves Retail, Houston
- Gluing Supplies & Equipment, Houston
- Go Kart Tracks, Houston
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Houston
- Golf Associations, Houston
- Golf Cars & Carts, Houston
- Golf Cars & Carts Repair & Service, Houston
- Golf Clubs Private, Houston
- Golf Course Architect, Houston
- Golf Course Architects, Houston
- Golf Course Construction, Houston
- Golf Course Consultants, Houston
- Golf Courses, Houston
- Golf Driving Ranges, Houston
- Golf Equipment & Supplies Stores, Houston - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Equipment Repair & Sales, Houston - Clubs, Carts, Bags & More
- Golf Lessons & Instruction, Houston
- Golf Tournament Planning, Houston
- Gospel Church, Houston
- Gourmet Food Stores, Houston
- Gourmet Restaurants, Houston
- Government, Houston
- Government And Administration Attorneys & Lawyers, Houston
- Government And Administration Attorneys & Lawyers, Houston
- Government And Administration Lawyers & Attorneys, Houston
- Government Associations, Houston
- Government Contract & Relations Consultants, Houston
- Government Information & Offices Miscellaneous, Houston
- Grading Contractors, Houston - Excavating - Excavation Companies
- Graduation Apparel & Supplies, Houston
- Grain Brokers, Houston
- Granite, Houston
- Granite Counter Tops, Houston
- Grape Vineyards, Houston
- Graphic Art Supplies & Equipment, Houston
- Graphic Design Services, Houston - Graphic Designer
- Graphic Designer & Artist Services, Houston
- Gratings Metal, Houston
- Gray & Ductile Iron Foundries, Houston
- Grease & Oil Disposal Sites, Houston
- Grease Collection Service, Houston
- Grease Traps, Houston
- Greek Churches, Houston
- Greek Restaurants, Houston
- Greeting Card Stores, Houston
- Grills & Grilling Equipment & Supplies, Houston
- Grinding Equipment & Supplies, Houston
- Grinding Services, Houston
- Grinding Wheels, Houston
- Grocery Store Delivery Service, Houston
- Grocery Stores & Supermarkets, Houston
- Ground Spices Manufacturers, Houston
- Ground Transportation, Except Passenger, Houston
- Group Homes, Houston
- Grout Sealing & Cleaning, Houston
- Guatemalan Restaurants, Houston
- Guest Houses & Ranches, Houston
- Guide & Directory Advertising Services, Houston
- Guided Missiles & Space Vehicles Manufacturers, Houston
- Guides & Shoppers, Houston
- Gun Repair & Services, Houston
- Gunite Contractors, Houston
- Guns & Gunsmith Services, Houston
- Gutter & Flashing Contractors, Houston - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gutter Covers, Houston
- Guttering Contractors, Houston - Gutter Cleaning & Repair Services
- Gutters & Downspout Cleaning & Repairing, Houston
- Gym Equipment & Supplies, Houston
- Gymnastics Schools, Houston
- Gynecologists, Houston - Gynecology Doctors, Physicians & Surgeons
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