- Games & Hobbies, Altadena
- Garage Door Repair, Altadena
- Garage Doors & Door Operating Devices, Altadena
- Garage Doors & Gates, Altadena - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Altadena
- Garbage & Rubbish Removal, Altadena
- Garment & Linen Services, Altadena
- Gas Station, Altadena - Service & Filling Station
- General Business Consulting, Altadena
- General Business Services, Altadena
- General Consultants, Altadena
- General Hardware Stores, Altadena
- General Merchandise Stores, Altadena
- Gift Novelty & Card Manufacturers, Altadena
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- Gift Shops, Altadena - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Altadena
- Glass & Glass Products, Altadena
- Glass Stained & Leaded, Altadena
- Golf Courses, Altadena
- Golf Equipment & Supplies Stores, Altadena - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Altadena
- Gospel Church, Altadena
- Government, Altadena
- Graphic Design Services, Altadena - Graphic Designer
- Graphic Designer & Artist Services, Altadena
- Grocery Stores & Supermarkets, Altadena
- Ground Transportation, Except Passenger, Altadena
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