- Garment & Linen Services, White Marsh
- Gas Station, White Marsh - Service & Filling Station
- Gazebo Builders, White Marsh - Installation, Repair & Maintenance Services
- General Business Consulting, White Marsh
- General Business Services, White Marsh
- General Consultants, White Marsh
- General Freight Trucking, White Marsh - Motor Freight
- General Hardware Stores, White Marsh
- Glass & Glazing Contractors, White Marsh
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- Glass Tinting & Coating, White Marsh - Home - Car Window Tinting
- Golf Equipment & Supplies Stores, White Marsh - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, White Marsh
- Grocery Stores & Supermarkets, White Marsh
- Ground Transportation, Except Passenger, White Marsh
- Gun Repair & Services, White Marsh
- Guns & Gunsmith Services, White Marsh
- Gymnastics Schools, White Marsh
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