- Garage, Door & Window Products, Marathon
- Garbage & Rubbish Removal, Marathon
- Garment & Linen Services, Marathon
- Gas Companies, Marathon
- Gas Station, Marathon - Service & Filling Station
- General Business Consulting, Marathon
- General Business Services, Marathon
- General Consultants, Marathon
- General Merchandise Stores, Marathon
- General Surgeons, Marathon - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Marathon
- Generator Sales & Rental, Marathon - Contractors Supplies & Equipment
- Gift Baskets, Marathon
- Gift Shops, Marathon - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Marathon
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- Gifts, Cards & Stationery Stores, Marathon
- Glass & Glass Products, Marathon
- Glass - Auto, Float, Plate, Window & Doors, Marathon
- Golf Cars & Carts, Marathon
- Golf Cars & Carts Repair & Service, Marathon
- Golf Clubs Private, Marathon
- Government, Marathon
- Government Contract & Relations Consultants, Marathon
- Government Information & Offices Miscellaneous, Marathon
- Granite, Marathon
- Grocery Stores & Supermarkets, Marathon
- Ground Transportation, Except Passenger, Marathon
- Guest Houses & Ranches, Marathon
- Gun Repair & Services, Marathon
- Guns & Gunsmith Services, Marathon
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