- Games & Hobbies, Martinez
- Garage Door Repair, Martinez
- Garage Doors & Door Operating Devices, Martinez
- Garage Doors & Gates, Martinez - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Martinez
- Garden & Lawn Sprinkler Repair, Installation & Service, Martinez
- Garden Ornaments, Martinez
- Garment & Linen Services, Martinez
- Gas Conversion Motor Vehicles, Martinez
- Gas Detection, Asbestos & Lead Contractors, Martinez
- Gas Engine, Martinez
- Gas Equipment Industrial, Martinez
- Gas Piping Contractors, Martinez - Gas Pipe Installation & Repair Service
- Gas Station, Martinez - Service & Filling Station
- Gasket, Martinez - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gemologists & Jewelers, Martinez
- General Business Consulting, Martinez
- General Business Services, Martinez
- General Consultants, Martinez
- General Electric/Ge Heat Equipment, Martinez
- General Hardware Stores, Martinez
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- General Merchandise Stores, Martinez
- General Travel Agents & Agencies, Martinez
- Glass & Glass Products, Martinez
- Glass & Glazing Contractors, Martinez
- Glass - Auto, Float, Plate, Window & Doors, Martinez
- Glass - Beveled, Carved, Etched & Ornamental, Martinez
- Glass Plate Windows, Martinez
- Go Kart Tracks, Martinez
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Martinez
- Golf Cars & Carts, Martinez
- Golf Courses, Martinez
- Government, Martinez
- Granite, Martinez
- Graphic Design Services, Martinez - Graphic Designer
- Graphic Designer & Artist Services, Martinez
- Greek Restaurants, Martinez
- Grocery Stores & Supermarkets, Martinez
- Ground Transportation, Except Passenger, Martinez
- Gun Repair & Services, Martinez
- Guns & Gunsmith Services, Martinez
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