- Game Farms, Hummelstown
- Games & Hobbies, Hummelstown
- Garage, Door & Window Products, Hummelstown
- Garment & Linen Services, Hummelstown
- Gas Station, Hummelstown - Service & Filling Station
- General Business Consulting, Hummelstown
- General Business Services, Hummelstown
- General Consultants, Hummelstown
- General Management Consulting Services, Hummelstown - Management Consultants
- General Merchandise Stores, Hummelstown
- General Travel Agents & Agencies, Hummelstown
- Gift Shops, Hummelstown - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Hummelstown
- Golf Courses, Hummelstown
- Golf Driving Ranges, Hummelstown
- Government, Hummelstown
- Grape Vineyards, Hummelstown
- Graphic Design Services, Hummelstown - Graphic Designer
- Graphic Designer & Artist Services, Hummelstown
- Greeting Card Stores, Hummelstown
- Grocery Stores & Supermarkets, Hummelstown
- Ground Transportation, Except Passenger, Hummelstown
- Gun & Hunting & Fishing Clubs, Hummelstown
- Gutters & Downspout Cleaning & Repairing, Hummelstown
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