- Garage Building & Repair, Altamont - Carports - Garage Builders
- Garbage & Rubbish Removal, Altamont
- Garment & Linen Services, Altamont
- Gas Station, Altamont - Service & Filling Station
- General Business Services, Altamont
- General Freight Trucking, Altamont - Motor Freight
- General Hardware Stores, Altamont
- General Merchandise Stores, Altamont
- General Travel Agents & Agencies, Altamont
- Generator Repair, Altamont
- Generators, Altamont - Solar, Steam, Wind Power, etc
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- Gifts, Cards & Stationery Stores, Altamont
- Government, Altamont
- Grain Elevators, Altamont
- Greeting Card Stores, Altamont
- Grills & Grilling Equipment & Supplies, Altamont
- Grocery Stores & Supermarkets, Altamont
- Ground Transportation, Except Passenger, Altamont
- Grout Sealing & Cleaning, Altamont
- Gun Repair & Services, Altamont
- Guns & Gunsmith Services, Altamont
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