- Garbage & Rubbish Removal, Middleburg
- Garment & Linen Services, Middleburg
- Gas Station, Middleburg - Service & Filling Station
- General Business Consulting, Middleburg
- General Business Services, Middleburg
- General Consultants, Middleburg
- General Merchandise Stores, Middleburg
- Gift Shops, Middleburg - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Middleburg
- Golf Course Architect, Middleburg
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- Golf Course Architects, Middleburg
- Gourmet Food Stores, Middleburg
- Government, Middleburg
- Graphic Design Services, Middleburg - Graphic Designer
- Graphic Designer & Artist Services, Middleburg
- Grocery Stores & Supermarkets, Middleburg
- Ground Transportation, Except Passenger, Middleburg
- Gun Repair & Services, Middleburg
- Guns & Gunsmith Services, Middleburg
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