- Garage Building & Repair, Plantsville - Carports - Garage Builders
- Garment & Linen Services, Plantsville
- Gas Station, Plantsville - Service & Filling Station
- General Business Consulting, Plantsville
- General Business Services, Plantsville
- General Consultants, Plantsville
- General Freight Trucking, Plantsville - Motor Freight
- General Management Consulting Services, Plantsville - Management Consultants
- General Merchandise Stores, Plantsville
- Gifts, Cards & Stationery Stores, Plantsville
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- Glassware & Chinaware Repair, Plantsville
- Government, Plantsville
- Granite, Plantsville
- Graphic Design Services, Plantsville - Graphic Designer
- Graphic Designer & Artist Services, Plantsville
- Grocery Stores & Supermarkets, Plantsville
- Ground Transportation, Except Passenger, Plantsville
- Group Homes, Plantsville
- Guard Rails, Plantsville
- Gymnastics Schools, Plantsville
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