- Garment & Linen Services, Madison
- Gas Companies, Madison
- Gas Station, Madison - Service & Filling Station
- General Business Consulting, Madison
- General Business Services, Madison
- General Consultants, Madison
- General Freight Trucking, Madison - Motor Freight
- General Merchandise Stores, Madison
- General Travel Agents & Agencies, Madison
- Gifts, Cards & Stationery Stores, Madison
- Glass & Glass Products, Madison
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- Glass - Auto, Float, Plate, Window & Doors, Madison
- Golf Cars & Carts, Madison
- Gospel Church, Madison
- Government, Madison
- Grading Contractors, Madison - Excavating - Excavation Companies
- Graphic Design Services, Madison - Graphic Designer
- Graphic Designer & Artist Services, Madison
- Grills & Grilling Equipment & Supplies, Madison
- Grocery Stores & Supermarkets, Madison
- Ground Transportation, Except Passenger, Madison
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