- Garage Door Repair, Cortland
- Garbage & Rubbish Removal, Cortland
- Garment & Linen Services, Cortland
- Gas Station, Cortland - Service & Filling Station
- General Business Consulting, Cortland
- General Business Services, Cortland
- General Consultants, Cortland
- General Hardware Stores, Cortland
- General Merchandise Stores, Cortland
- General Travel Agents & Agencies, Cortland
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- Generator Sales & Rental, Cortland - Contractors Supplies & Equipment
- Generators, Compressors, Pumps, Motors & Fans, Cortland
- Golf Courses, Cortland
- Government, Cortland
- Grocery Stores & Supermarkets, Cortland
- Ground Transportation, Except Passenger, Cortland
- Gun Repair & Services, Cortland
- Guns & Gunsmith Services, Cortland
- Gymnastics Schools, Cortland
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