- 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 & Air Compressors, Altoona
- Gas Companies, Altoona
- Gas Equipment Industrial, Altoona
- Gas Station, Altoona - Service & Filling Station
- Gasoline, Altoona
- General Business Consulting, Altoona
- General Business Services, Altoona
- General Consultants, Altoona
- General Freight Trucking, Altoona - Motor Freight
- General Management Consulting Services, Altoona - Management Consultants
- General Merchandise Stores, Altoona
- General Surgeons, Altoona - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Altoona
- Generators, Compressors, Pumps, Motors & Fans, Altoona
- Gift Baskets, Altoona
- Gift Shops, Altoona - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Altoona
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- Gifts, Cards & Stationery Stores, Altoona
- Glass & Fiber Glass Materials, Altoona - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Altoona
- Glass - Auto, Float, Plate, Window & Doors, Altoona
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Altoona
- Golf Courses, Altoona
- Golf Equipment & Supplies Stores, Altoona - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Altoona
- Gospel Church, Altoona
- Gourmet Restaurants, Altoona
- Government, Altoona
- Granite, Altoona
- Graphic Design Services, Altoona - Graphic Designer
- Graphic Designer & Artist Services, Altoona
- Greek Restaurants, Altoona
- Greeting Card Stores, Altoona
- Grocery Stores & Supermarkets, Altoona
- Ground Transportation, Except Passenger, Altoona
- Guide & Directory Advertising Services, Altoona
- Gun Repair & Services, Altoona
- Guns & Gunsmith Services, Altoona
- Gymnastics Schools, Altoona
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