- Games & Hobbies, Penn Yan
- Garment & Linen Services, Penn Yan
- Gas Station, Penn Yan - Service & Filling Station
- General Business Services, Penn Yan
- General Hardware Stores, Penn Yan
- General Merchandise Stores, Penn Yan
- Generators, Compressors, Pumps, Motors & Fans, Penn Yan
- Geothermal Heating & Cooling Contractors, Penn Yan - Geothermal HVAC - Installation
- Geothermal Heating & Cooling Equipment, Systems & Supplies, Penn Yan
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- Gifts, Cards & Stationery Stores, Penn Yan
- Glass & Glass Products, Penn Yan
- Glass - Auto, Float, Plate, Window & Doors, Penn Yan
- Go Kart Tracks, Penn Yan
- Golf Clubs Private, Penn Yan
- Government, Penn Yan
- Grape Vineyards, Penn Yan
- Grocery Stores & Supermarkets, Penn Yan
- Ground Transportation, Except Passenger, Penn Yan
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