- Games & Hobbies, Altoona
- Garage Doors & Door Operating Devices, Altoona
- Garage Doors & Gates, Altoona - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Altoona
- Garbage & Rubbish Removal, Altoona
- Garment & Linen Services, Altoona
- Gas Station, Altoona - Service & Filling Station
- General Business Consulting, Altoona
- General Business Services, Altoona
- General Consultants, Altoona
- General Hardware Stores, Altoona
- General Merchandise Stores, Altoona
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- General Travel Agents & Agencies, Altoona
- Gift Shops, Altoona - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Altoona
- Glass & Glass Products, Altoona
- Glass - Beveled, Carved, Etched & Ornamental, Altoona
- Golf Courses, Altoona
- Gourmet Restaurants, Altoona
- Government, Altoona
- Grain Elevators, Altoona
- Grocery Stores & Supermarkets, Altoona
- Ground Transportation, Except Passenger, Altoona
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