- Games & Hobbies, Simpsonville
- Garage, Door & Window Products, Simpsonville
- Garbage & Rubbish Removal, Simpsonville
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Simpsonville
- Garment & Linen Services, Simpsonville
- Gas & Air Compressors, Simpsonville
- Gas Companies, Simpsonville
- Gas Station, Simpsonville - Service & Filling Station
- General Business Consulting, Simpsonville
- General Business Services, Simpsonville
- General Consultants, Simpsonville
- General Freight Trucking, Simpsonville - Motor Freight
- General Hardware Stores, Simpsonville
- General Management Consulting Services, Simpsonville - Management Consultants
- General Merchandise Stores, Simpsonville
- General Travel Agents & Agencies, Simpsonville
- Generator Rental & Leasing, Simpsonville
- Generators, Simpsonville - Solar, Steam, Wind Power, etc
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- Generators, Compressors, Pumps, Motors & Fans, Simpsonville
- Gift Shops, Simpsonville - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Simpsonville
- Glass, Plastic & Rubber Working Machinery, Simpsonville
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Simpsonville
- Golf Clubs Private, Simpsonville
- Golf Courses, Simpsonville
- Government, Simpsonville
- Grading Contractors, Simpsonville - Excavating - Excavation Companies
- Granite, Simpsonville
- Graphic Designer & Artist Services, Simpsonville
- Greeting Card Stores, Simpsonville
- Grocery Stores & Supermarkets, Simpsonville
- Ground Transportation, Except Passenger, Simpsonville
- Gun Repair & Services, Simpsonville
- Guns & Gunsmith Services, Simpsonville
- Gymnastics Schools, Simpsonville
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