- Games & Hobbies, Peterborough
- Garment & Linen Services, Peterborough
- Gasoline, Peterborough
- Gemologists & Jewelers, Peterborough
- General Business Consulting, Peterborough
- General Business Services, Peterborough
- General Consultants, Peterborough
- General Hardware Stores, Peterborough
- General Management Consulting Services, Peterborough - Management Consultants
- General Merchandise Stores, Peterborough
- Generators, Compressors, Pumps, Motors & Fans, Peterborough
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- Gift Shops, Peterborough - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Peterborough
- Golf Courses, Peterborough
- Gourmet Food Stores, Peterborough
- Government, Peterborough
- Graphic Design Services, Peterborough - Graphic Designer
- Graphic Designer & Artist Services, Peterborough
- Greeting Card Stores, Peterborough
- Grocery Stores & Supermarkets, Peterborough
- Ground Transportation, Except Passenger, Peterborough
- Gun & Hunting & Fishing Clubs, Peterborough
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