- Games & Hobbies, Johnston
- Garbage & Rubbish Removal, Johnston
- Garment & Linen Services, Johnston
- Gas Companies, Johnston
- General Business Consulting, Johnston
- General Business Services, Johnston
- General Consultants, Johnston
- General Hardware Stores, Johnston
- General Management Consulting Services, Johnston - Management Consultants
- General Merchandise Stores, Johnston
- General Travel Agents & Agencies, Johnston
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- Gifts, Cards & Stationery Stores, Johnston
- Golf Clubs Private, Johnston
- Golf Courses, Johnston
- Gourmet Restaurants, Johnston
- Government, Johnston
- Graphic Design Services, Johnston - Graphic Designer
- Graphic Designer & Artist Services, Johnston
- Greeting Card Stores, Johnston
- Grills & Grilling Equipment & Supplies, Johnston
- Grocery Stores & Supermarkets, Johnston
- Ground Transportation, Except Passenger, Johnston
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