- Game & Wildlife Consultants, Ayer
- Garage, Door & Window Products, Ayer
- Garbage & Rubbish Removal, Ayer
- Garment & Linen Services, Ayer
- Gas & Air Compressors, Ayer
- Gas Piping Contractors, Ayer - Gas Pipe Installation & Repair Service
- Gas Station, Ayer - Service & Filling Station
- General Business Services, Ayer
- General Freight Trucking, Ayer - Motor Freight
- General Management Consulting Services, Ayer - Management Consultants
- General Merchandise Stores, Ayer
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- General Travel Agents & Agencies, Ayer
- Generators, Compressors, Pumps, Motors & Fans, Ayer
- Gifts, Cards & Stationery Stores, Ayer
- Glass & Glass Products, Ayer
- Glass - Auto, Float, Plate, Window & Doors, Ayer
- Government, Ayer
- Graphic Design Services, Ayer - Graphic Designer
- Graphic Designer & Artist Services, Ayer
- Greeting Card Stores, Ayer
- Grocery Stores & Supermarkets, Ayer
- Ground Transportation, Except Passenger, Ayer
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