- Games & Hobbies, Williamsville
- Garment & Linen Services, Williamsville
- Garment Pressing & Cleaners Agents, Williamsville - Laundries & Dry Cleaners
- Gas Companies, Williamsville
- Gas Station, Williamsville - Service & Filling Station
- Gazebo Builders, Williamsville - Installation, Repair & Maintenance Services
- Gemologists & Jewelers, Williamsville
- General Business Consulting, Williamsville
- General Business Services, Williamsville
- General Consultants, Williamsville
- General Management Consulting Services, Williamsville - Management Consultants
- General Merchandise Stores, Williamsville
- General Surgeons, Williamsville - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Williamsville
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- Gift Shops, Williamsville - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Williamsville
- Glass & Glass Products, Williamsville
- Glass - Auto, Float, Plate, Window & Doors, Williamsville
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Williamsville
- Government, Williamsville
- Government And Administration Attorneys & Lawyers, Williamsville
- Government And Administration Attorneys & Lawyers, Williamsville
- Government And Administration Lawyers & Attorneys, Williamsville
- Graphic Design Services, Williamsville - Graphic Designer
- Graphic Designer & Artist Services, Williamsville
- Grills & Grilling Equipment & Supplies, Williamsville
- Grocery Stores & Supermarkets, Williamsville
- Ground Transportation, Except Passenger, Williamsville
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