- Games & Hobbies, Merrillville
- Garage Building & Repair, Merrillville - Carports - Garage Builders
- Garage Door Repair, Merrillville
- Garage Doors & Door Operating Devices, Merrillville
- Garage Doors & Gates, Merrillville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Merrillville
- Garment & Linen Services, Merrillville
- Garment Pressing & Cleaners Agents, Merrillville - Laundries & Dry Cleaners
- Gas Companies, Merrillville
- Gas Station, Merrillville - Service & Filling Station
- Gastroenterologists, Merrillville - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Merrillville
- General Business Services, Merrillville
- General Consultants, Merrillville
- General Hardware Stores, Merrillville
- General Management Consulting Services, Merrillville - Management Consultants
- General Merchandise Stores, Merrillville
- General Surgeons, Merrillville - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Merrillville
- Generators, Compressors, Pumps, Motors & Fans, Merrillville
- Gift Shops, Merrillville - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Merrillville
- Gifts, Cards & Stationery Stores, Merrillville
- Glass & Fiber Glass Materials, Merrillville - Wholesale, Manufacturers & Suppliers
- Glass & Glass Products, Merrillville
- Glass & Glazing Contractors, Merrillville
- Glass - Auto, Float, Plate, Window & Doors, Merrillville
- Glass Giftware, Merrillville
- Glass Tinting & Coating, Merrillville - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Merrillville
- Golf Courses, Merrillville
- Gourmet Restaurants, Merrillville
- Government, Merrillville
- Government And Administration Attorneys & Lawyers, Merrillville
- Government And Administration Attorneys & Lawyers, Merrillville
- Government And Administration Lawyers & Attorneys, Merrillville
- Graphic Designer & Artist Services, Merrillville
- Greek Restaurants, Merrillville
- Greeting Card Stores, Merrillville
- Grinding Services, Merrillville
- Grocery Stores & Supermarkets, Merrillville
- Ground Transportation, Except Passenger, Merrillville
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