- Games & Hobbies, National City
- Garage Door Repair, National City
- Garage Doors & Door Operating Devices, National City
- Garage Doors & Gates, National City - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, National City
- Garment & Linen Services, National City
- Gas Line Installation Contractors, National City - Gas Pipe Installation - Repair Service
- Gas Station, National City - Service & Filling Station
- Gasket, National City - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gastroenterologists, National City - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, National City
- General Business Services, National City
- General Consultants, National City
- General Freight Trucking, National City - Motor Freight
- General Hardware Stores, National City
- General Management Consulting Services, National City - Management Consultants
- General Merchandise Stores, National City
- General Surgeons, National City - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, National City
- Generators, Compressors, Pumps, Motors & Fans, National City
- Gift Shops, National City - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, National City
- Gifts Wholesale & Retail, National City
- Gifts, Cards & Stationery Stores, National City
- Glass & Glass Products, National City
- Glass & Glazing Contractors, National City
- Glass - Auto, Float, Plate, Window & Doors, National City
- Glass Furniture Tops, National City
- Glass Plate Windows, National City
- Glass Stained & Leaded, National City
- Glass Tinting & Coating, National City - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, National City
- Golf Courses, National City
- Government, National City
- Government Contract & Relations Consultants, National City
- Government Information & Offices Miscellaneous, National City
- Graphic Design Services, National City - Graphic Designer
- Graphic Designer & Artist Services, National City
- Greeting Card Stores, National City
- Grocery Stores & Supermarkets, National City
- Ground Transportation, Except Passenger, National City
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