- Games & Hobbies, Oswego
- Garage Building & Repair, Oswego - Carports - Garage Builders
- Garage Door Repair, Oswego
- Garage Doors & Door Operating Devices, Oswego
- Garage Doors & Gates, Oswego - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Oswego
- Garment & Linen Services, Oswego
- Gas Station, Oswego - Service & Filling Station
- Gasoline, Oswego
- Gemologists & Jewelers, Oswego
- General Business Services, Oswego
- General Freight Trucking, Oswego - Motor Freight
- General Hardware Stores, Oswego
- General Merchandise Stores, Oswego
- General Travel Agents & Agencies, Oswego
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- Generators, Compressors, Pumps, Motors & Fans, Oswego
- Gifts, Cards & Stationery Stores, Oswego
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Oswego
- Golf Courses, Oswego
- Golf Equipment & Supplies Stores, Oswego - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Oswego
- Government, Oswego
- Granite, Oswego
- Graphic Design Services, Oswego - Graphic Designer
- Graphic Designer & Artist Services, Oswego
- Greek Restaurants, Oswego
- Greeting Card Stores, Oswego
- Grocery Stores & Supermarkets, Oswego
- Ground Transportation, Except Passenger, Oswego
- Gymnastics Schools, Oswego
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