- Gambling & Lottery Services, Cortland
- Games & Hobbies, Cortland
- Garage Door Repair, Cortland
- Garage Doors & Door Operating Devices, Cortland
- Garage Doors & Gates, Cortland - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Cortland
- Garbage & Rubbish Removal, Cortland
- Garment & Linen Services, Cortland
- Gas Appliance Repair, Maintenance & Service, Cortland
- Gas Companies, Cortland
- Gas Engine, Cortland
- Gas Station, Cortland - Service & Filling Station
- General Business Consulting, Cortland
- General Business Services, Cortland
- General Consultants, Cortland
- General Freight Trucking, Cortland - Motor Freight
- General Merchandise Stores, Cortland
- General Travel Agents & Agencies, Cortland
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- Geotechnical Engineer, Cortland
- Gift Baskets, Cortland
- Gifts By Type & Occasion, Cortland
- Gifts, Cards & Stationery Stores, Cortland
- Glass & Glass Products, Cortland
- Glass - Auto, Float, Plate, Window & Doors, Cortland
- Golf Clubs Private, Cortland
- Golf Courses, Cortland
- Gourmet Restaurants, Cortland
- Government, Cortland
- Graphic Design Services, Cortland - Graphic Designer
- Graphic Designer & Artist Services, Cortland
- Grocery Stores & Supermarkets, Cortland
- Ground Transportation, Except Passenger, Cortland
- Gun Repair & Services, Cortland
- Guns & Gunsmith Services, Cortland
- Gutters & Downspout Cleaning & Repairing, Cortland
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