- Garment & Linen Services, Guilderland
- General Business Services, Guilderland
- General Management Consulting Services, Guilderland - Management Consultants
- General Travel Agents & Agencies, Guilderland
- Gifts, Cards & Stationery Stores, Guilderland
- Glass & Glass Products, Guilderland
- Glass - Auto, Float, Plate, Window & Doors, Guilderland
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- Golf Courses, Guilderland
- Golf Equipment & Supplies Stores, Guilderland - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Guilderland
- Government, Guilderland
- Grocery Stores & Supermarkets, Guilderland
- Ground Transportation, Except Passenger, Guilderland
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