- Garment & Linen Services, Irmo
- Gas Appliance Repair, Maintenance & Service, Irmo
- Gas Detection, Asbestos & Lead Contractors, Irmo
- Gas Station, Irmo - Service & Filling Station
- Gastroenterologists, Irmo - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Irmo
- General Business Services, Irmo
- General Consultants, Irmo
- General Freight Trucking, Irmo - Motor Freight
- General Management Consulting Services, Irmo - Management Consultants
- General Merchandise Stores, Irmo
- General Travel Agents & Agencies, Irmo
- Generators, Compressors, Pumps, Motors & Fans, Irmo
- Geotechnical Engineer, Irmo
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- Gifts, Cards & Stationery Stores, Irmo
- Glass & Glass Products, Irmo
- Glass & Glazing Contractors, Irmo
- Glass - Auto, Float, Plate, Window & Doors, Irmo
- Glass Stained & Leaded, Irmo
- Glass Tinting & Coating, Irmo - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Irmo
- Government, Irmo
- Grading Contractors, Irmo - Excavating - Excavation Companies
- Grease Traps, Irmo
- Grocery Stores & Supermarkets, Irmo
- Ground Transportation, Except Passenger, Irmo
- Gymnastics Schools, Irmo
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