- Games & Hobbies, Castro Valley
- Garage Doors & Door Operating Devices, Castro Valley
- Garage Doors & Gates, Castro Valley - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Castro Valley
- Garment & Linen Services, Castro Valley
- Garment Pressing & Cleaners Agents, Castro Valley - Laundries & Dry Cleaners
- Gas Line Installation Contractors, Castro Valley - Gas Pipe Installation - Repair Service
- Gas Station, Castro Valley - Service & Filling Station
- Gastroenterologists, Castro Valley - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Castro Valley
- General Business Consulting, Castro Valley
- General Business Services, Castro Valley
- General Consultants, Castro Valley
- General Hardware Stores, Castro Valley
- General Management Consulting Services, Castro Valley - Management Consultants
- General Merchandise Stores, Castro Valley
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- General Travel Agents & Agencies, Castro Valley
- Gift Shops, Castro Valley - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Castro Valley
- Glass & Glass Products, Castro Valley
- Glass & Glazing Contractors, Castro Valley
- Glass Decorative, Castro Valley
- Glass Engravers, Castro Valley
- Glass Plate Windows, Castro Valley
- Glass Tinting & Coating, Castro Valley - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Castro Valley
- Gourmet Restaurants, Castro Valley
- Government, Castro Valley
- Graphic Design Services, Castro Valley - Graphic Designer
- Graphic Designer & Artist Services, Castro Valley
- Grocery Stores & Supermarkets, Castro Valley
- Ground Transportation, Except Passenger, Castro Valley
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