- Garbage & Rubbish Removal, Portland
- Garbage Disposals, Portland
- Garment & Linen Services, Portland
- Gas Companies, Portland
- Gas Pipelines, Portland
- Gas Station, Portland - Service & Filling Station
- General Business Consulting, Portland
- General Business Services, Portland
- General Consultants, Portland
- General Freight Trucking, Portland - Motor Freight
- General Hardware Stores, Portland
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- General Merchandise Stores, Portland
- Gifts, Cards & Stationery Stores, Portland
- Glass & Glass Products, Portland
- Glass Stained & Leaded, Portland
- Golf Clubs Private, Portland
- Government, Portland
- Graphic Design Services, Portland - Graphic Designer
- Graphic Designer & Artist Services, Portland
- Grocery Stores & Supermarkets, Portland
- Ground Transportation, Except Passenger, Portland
- Gun & Hunting & Fishing Clubs, Portland
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