- Games & Hobbies, Glendora
- Games Toys & Childrens Vehicles Manufacturers, Glendora
- Garage Door Repair, Glendora
- Garage Doors & Door Operating Devices, Glendora
- Garage Doors & Gates, Glendora - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Glendora
- Garbage & Rubbish Removal, Glendora
- Garden & Lawn Sprinkler Repair, Installation & Service, Glendora
- Garment & Linen Services, Glendora
- Gas Detection, Asbestos & Lead Contractors, Glendora
- Gas Engine, Glendora
- Gas Station, Glendora - Service & Filling Station
- Gastroenterologists, Glendora - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Glendora
- General Business Consulting, Glendora
- General Business Services, Glendora
- General Consultants, Glendora
- General Freight Trucking, Glendora - Motor Freight
- General Hardware Stores, Glendora
- General Management Consulting Services, Glendora - Management Consultants
- General Merchandise Stores, Glendora
- General Travel Agents & Agencies, Glendora
- Gift Baskets, Glendora
- Gifts By Type & Occasion, Glendora
- Gifts Wholesale & Retail, Glendora
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- Gifts, Cards & Stationery Stores, Glendora
- Glass & Glass Products, Glendora
- Glass & Glazing Contractors, Glendora
- Glass - Auto, Float, Plate, Window & Doors, Glendora
- Glass Bending Beveling Drilling Grinding Etcetera, Glendora
- Glass Plate Windows, Glendora
- Glass Tinting & Coating, Glendora - Home - Car Window Tinting
- Gluing Supplies & Equipment, Glendora
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Glendora
- Golf Courses, Glendora
- Golf Driving Ranges, Glendora
- Golf Equipment & Supplies Stores, Glendora - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Glendora
- Government Contract & Relations Consultants, Glendora
- Government Information & Offices Miscellaneous, Glendora
- Graphic Design Services, Glendora - Graphic Designer
- Graphic Designer & Artist Services, Glendora
- Greenhouse Supplies, Kits & Equipment, Glendora
- Greeting Card Stores, Glendora
- Grocery Stores & Supermarkets, Glendora
- Ground Transportation, Except Passenger, Glendora
- Group Homes, Glendora
- Guest Houses & Ranches, Glendora
- Gymnastics Schools, Glendora
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