- Games & Hobbies, Belvidere
- Garment & Linen Services, Belvidere
- Gas Piping Contractors, Belvidere - Gas Pipe Installation & Repair Service
- Gas Station, Belvidere - Service & Filling Station
- General Business Consulting, Belvidere
- General Business Services, Belvidere
- General Consultants, Belvidere
- General Freight Trucking, Belvidere - Motor Freight
- General Hardware Stores, Belvidere
- General Management Consulting Services, Belvidere - Management Consultants
- General Merchandise Stores, Belvidere
- General Travel Agents & Agencies, Belvidere
- Gifts, Cards & Stationery Stores, Belvidere
- Glass & Glass Products, Belvidere
- Glass Stained & Leaded, Belvidere
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- Gold, Silver & Platinum Buyers, Sellers & Dealers, Belvidere
- Golf Clubs Private, Belvidere
- Golf Courses, Belvidere
- Gourmet Restaurants, Belvidere
- Government, Belvidere
- Grain Elevators, Belvidere
- Greek Restaurants, Belvidere
- Grills & Grilling Equipment & Supplies, Belvidere
- Grinding Services, Belvidere
- Grocery Stores & Supermarkets, Belvidere
- Ground Transportation, Except Passenger, Belvidere
- Gun Repair & Services, Belvidere
- Guns & Gunsmith Services, Belvidere
- Gutter & Flashing Contractors, Belvidere - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Guttering Contractors, Belvidere - Gutter Cleaning & Repair Services
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