- Games & Hobbies, Portland
- Garment & Linen Services, Portland
- Gas Companies, Portland
- Gas Station, Portland - Service & Filling Station
- Gemologists & Jewelers, Portland
- General Business Consulting, Portland
- General Business Services, Portland
- General Consultants, Portland
- General Merchandise Stores, Portland
- Gifts, Cards & Stationery Stores, Portland
- Glass & Glass Products, Portland
- Glass - Auto, Float, Plate, Window & Doors, Portland
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- Glass Furniture Tops, Portland
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Portland
- Golf Clubs Private, Portland
- Golf Courses, Portland
- Government, Portland
- Grain Elevators, Portland
- Grocery Stores & Supermarkets, Portland
- Ground Transportation, Except Passenger, Portland
- Gun Repair & Services, Portland
- Guns & Gunsmith Services, Portland
- Gymnastics Schools, Portland
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