- Games & Hobbies, Westerville
- Garage Building & Repair, Westerville - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Westerville
- Garage Doors & Gates, Westerville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Westerville
- Garbage & Rubbish Removal, Westerville
- Garden & Lawn Sprinkler Repair, Installation & Service, Westerville
- Garment & Linen Services, Westerville
- Gas Appliance Repair, Maintenance & Service, Westerville
- Gas Equipment & Supplies, Westerville
- Gas Equipment & Supplies, Westerville - Gas Piping
- Gas Equipment Industrial, Westerville
- Gas Station, Westerville - Service & Filling Station
- Gasoline, Westerville
- Gemologists & Jewelers, Westerville
- General Business Consulting, Westerville
- General Business Services, Westerville
- General Consultants, Westerville
- General Freight Trucking, Westerville - Motor Freight
- General Hardware Stores, Westerville
- General Management Consulting Services, Westerville - Management Consultants
- General Merchandise Stores, Westerville
- General Surgeons, Westerville - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Westerville
- Gift Shops, Westerville - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Westerville
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- Gifts, Cards & Stationery Stores, Westerville
- Glass & Glass Products, Westerville
- Glass & Glazing Contractors, Westerville
- Glass - Auto, Float, Plate, Window & Doors, Westerville
- Glass Tinting & Coating, Westerville - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Westerville
- Golf Clubs Private, Westerville
- Golf Courses, Westerville
- Golf Driving Ranges, Westerville
- Golf Equipment & Supplies Stores, Westerville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Westerville
- Gourmet Restaurants, Westerville
- Government, Westerville
- Grace Brethren, Westerville
- Grading Contractors, Westerville - Excavating - Excavation Companies
- Graphic Design Services, Westerville - Graphic Designer
- Graphic Designer & Artist Services, Westerville
- Greek Restaurants, Westerville
- Greeting Card Stores, Westerville
- Grocery Stores & Supermarkets, Westerville
- Ground Transportation, Except Passenger, Westerville
- Gun Repair & Services, Westerville
- Guns & Gunsmith Services, Westerville
- Gutters & Downspout Cleaning & Repairing, Westerville
- Gymnastics Schools, Westerville
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