- Gambling & Lottery Services, Port Clinton
- Garage Doors & Door Operating Devices, Port Clinton
- Garage Doors & Gates, Port Clinton - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Port Clinton
- Garment & Linen Services, Port Clinton
- Gas Station, Port Clinton - Service & Filling Station
- Gemologists & Jewelers, Port Clinton
- General Business Consulting, Port Clinton
- General Business Services, Port Clinton
- General Consultants, Port Clinton
- General Hardware Stores, Port Clinton
- General Merchandise Stores, Port Clinton
- General Surgeons, Port Clinton - General Surgery Doctors, Physicians & Surgeons
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- General Travel Agents & Agencies, Port Clinton
- Generator Sales & Rental, Port Clinton - Contractors Supplies & Equipment
- Generators, Compressors, Pumps, Motors & Fans, Port Clinton
- Gifts, Cards & Stationery Stores, Port Clinton
- Glass & Glass Products, Port Clinton
- Glass - Auto, Float, Plate, Window & Doors, Port Clinton
- Glass Plate Windows, Port Clinton
- Golf Cars & Carts, Port Clinton
- Golf Clubs Private, Port Clinton
- Golf Courses, Port Clinton
- Government, Port Clinton
- Grocery Stores & Supermarkets, Port Clinton
- Ground Transportation, Except Passenger, Port Clinton
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