- Games & Hobbies, Peterborough
- Garage Building & Repair, Peterborough - Carports - Garage Builders
- Garage Door Repair, Peterborough
- Garage Doors & Door Operating Devices, Peterborough
- Garage Doors & Gates, Peterborough - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Peterborough
- Garbage & Rubbish Removal, Peterborough
- Garment & Linen Services, Peterborough
- Gas Engine, Peterborough
- Gas Equipment Industrial, Peterborough
- Gas Pipe, Peterborough
- Gas Station, Peterborough - Service & Filling Station
- Gastroenterologists, Peterborough - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gay & Lesbian Service Organizations, Peterborough
- Gemologists & Jewelers, Peterborough
- General Business Consulting, Peterborough
- General Business Services, Peterborough
- General Consultants, Peterborough
- General Freight Trucking, Peterborough - Motor Freight
- General Hardware Stores, Peterborough
- General Management Consultants & Services, Peterborough
- General Management Consulting Services, Peterborough - Management Consultants
- General Merchandise Stores, Peterborough
- General Travel Agents & Agencies, Peterborough
- Generators, Compressors, Pumps, Motors & Fans, Peterborough
- Geosynthetics, Peterborough
- Geothermal Heating & Cooling Contractors, Peterborough - Geothermal HVAC - Installation
- Gift Baskets, Peterborough
- Gift Shops, Peterborough - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Peterborough
- Gifts, Cards & Stationery Stores, Peterborough
- Glass & Glass Products, Peterborough
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- Glass & Glazing Contractors, Peterborough
- Glass - Auto, Float, Plate, Window & Doors, Peterborough
- Glass Block & Architectural, Peterborough
- Glass Stained & Leaded, Peterborough
- Glass Tinting & Coating, Peterborough - Home - Car Window Tinting
- Go Kart Tracks, Peterborough
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Peterborough
- Golf Clubs Private, Peterborough
- Golf Courses, Peterborough
- Golf Driving Ranges, Peterborough
- Golf Equipment & Supplies Stores, Peterborough - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Goodyear Tires, Peterborough - Dealers
- Gospel Church, Peterborough
- Gourmet Restaurants, Peterborough
- Government, Peterborough
- Government Contract & Relations Consultants, Peterborough
- Government Information & Offices Miscellaneous, Peterborough
- Granite, Peterborough
- Graphic Design Services, Peterborough - Graphic Designer
- Graphic Designer & Artist Services, Peterborough
- Grease & Oil Disposal Sites, Peterborough
- Greek Churches, Peterborough
- Greek Restaurants, Peterborough
- Greeting Card Stores, Peterborough
- Grills & Grilling Equipment & Supplies, Peterborough
- Grocery Stores & Supermarkets, Peterborough
- Ground Transportation, Except Passenger, Peterborough
- Group Homes, Peterborough
- Gun Repair & Services, Peterborough
- Guns & Gunsmith Services, Peterborough
- Gutter & Flashing Contractors, Peterborough - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastic Clubs, Peterborough
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