- Garbage & Rubbish Removal, Eureka
- Garment & Linen Services, Eureka
- Gastroenterologists, Eureka - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Eureka
- General Business Services, Eureka
- General Consultants, Eureka
- General Freight Trucking, Eureka - Motor Freight
- General Hardware Stores, Eureka
- General Merchandise Stores, Eureka
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- Geothermal Heating & Cooling Contractors, Eureka - Geothermal HVAC - Installation
- Gifts, Cards & Stationery Stores, Eureka
- Golf Courses, Eureka
- Government, Eureka
- Grain Elevators, Eureka
- Greeting Card Stores, Eureka
- Grocery Stores & Supermarkets, Eureka
- Ground Transportation, Except Passenger, Eureka
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