- Garment & Linen Services, Clay Center
- Gas Companies, Clay Center
- Gas Station, Clay Center - Service & Filling Station
- General Business Consulting, Clay Center
- General Business Services, Clay Center
- General Consultants, Clay Center
- General Freight Trucking, Clay Center - Motor Freight
- General Hardware Stores, Clay Center
- General Merchandise Stores, Clay Center
- Generators, Compressors, Pumps, Motors & Fans, Clay Center
- Gifts, Cards & Stationery Stores, Clay Center
- Glass & Glass Products, Clay Center
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- Glass - Auto, Float, Plate, Window & Doors, Clay Center
- Golf Clubs Private, Clay Center
- Golf Courses, Clay Center
- Gourmet Food Stores, Clay Center
- Government, Clay Center
- Grain Elevators, Clay Center
- Grain Production, Clay Center
- Grain Systems, Clay Center
- Granite, Clay Center
- Greeting Card Stores, Clay Center
- Grocery Stores & Supermarkets, Clay Center
- Ground Transportation, Except Passenger, Clay Center
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