- Games & Hobbies, San Marcos
- Garage Door Repair, San Marcos
- Garage Doors & Door Operating Devices, San Marcos
- Garage Doors & Gates, San Marcos - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, San Marcos
- Garbage & Rubbish Removal, San Marcos
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, San Marcos
- Garden Ornaments, San Marcos
- Garment & Linen Services, San Marcos
- Gas Companies, San Marcos
- Gas Detection, Asbestos & Lead Contractors, San Marcos
- Gas Equipment Industrial, San Marcos
- Gas Station, San Marcos - Service & Filling Station
- Gasket, San Marcos - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gemstone Jewelers, San Marcos
- General Business Consulting, San Marcos
- General Business Services, San Marcos
- General Consultants, San Marcos
- General Freight Trucking, San Marcos - Motor Freight
- General Hardware Stores, San Marcos
- General Management Consulting Services, San Marcos - Management Consultants
- General Merchandise Stores, San Marcos
- General Travel Agents & Agencies, San Marcos
- Generators, Compressors, Pumps, Motors & Fans, San Marcos
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- Gift Baskets, San Marcos
- Gifts By Type & Occasion, San Marcos
- Gifts, Cards & Stationery Stores, San Marcos
- Glass & Fiber Glass Materials, San Marcos - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, San Marcos
- Glass - Auto, Float, Plate, Window & Doors, San Marcos
- Glass Plate Windows, San Marcos
- Glass Stained & Leaded, San Marcos
- Golf Courses, San Marcos
- Golf Equipment & Supplies Stores, San Marcos - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Equipment Repair & Sales, San Marcos - Clubs, Carts, Bags & More
- Golf Lessons & Instruction, San Marcos
- Government, San Marcos
- Granite, San Marcos
- Graphic Design Services, San Marcos - Graphic Designer
- Graphic Designer & Artist Services, San Marcos
- Greek Restaurants, San Marcos
- Greeting Card Stores, San Marcos
- Grills & Grilling Equipment & Supplies, San Marcos
- Grocery Stores & Supermarkets, San Marcos
- Ground Transportation, Except Passenger, San Marcos
- Gun Repair & Services, San Marcos
- Guns & Gunsmith Services, San Marcos
- Gymnastics Schools, San Marcos
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