- Gaian Church, Longmont
- Game & Wildlife Consultants, Longmont
- Games & Hobbies, Longmont
- Garage Door Repair, Longmont
- Garage Doors & Door Operating Devices, Longmont
- Garage Doors & Gates, Longmont - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Longmont
- Garbage & Rubbish Removal, Longmont
- Garment & Linen Services, Longmont
- Gas Companies, Longmont
- Gas Detection, Asbestos & Lead Contractors, Longmont
- Gas Detectors & Analyzing, Longmont
- Gas Equipment Industrial, Longmont
- Gas Line Installation Contractors, Longmont - Gas Pipe Installation - Repair Service
- Gas Station, Longmont - Service & Filling Station
- Gastroenterologists, Longmont - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Longmont
- General Business Consulting, Longmont
- General Business Services, Longmont
- General Consultants, Longmont
- General Freight Trucking, Longmont - Motor Freight
- General Hardware Stores, Longmont
- General Management Consulting Services, Longmont - Management Consultants
- General Merchandise Stores, Longmont
- General Surgeons, Longmont - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Longmont
- Generators, Compressors, Pumps, Motors & Fans, Longmont
- Geriatricians, Longmont - Geriatric Specialists, Doctors, Physicians & Surgeons
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- Gift Baskets, Longmont
- Gift Shops, Longmont - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Longmont
- Gifts, Cards & Stationery Stores, Longmont
- Glass & Glass Products, Longmont
- Glass & Glazing Contractors, Longmont
- Glass - Auto, Float, Plate, Window & Doors, Longmont
- Glass Repair, Longmont - Car, Window, Auto Glass Repair
- Glass Tinting & Coating, Longmont - Home - Car Window Tinting
- Golf Clubs Private, Longmont
- Golf Courses, Longmont
- Golf Equipment & Supplies Stores, Longmont - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Equipment Repair & Sales, Longmont - Clubs, Carts, Bags & More
- Gospel Church, Longmont
- Gourmet Restaurants, Longmont
- Government, Longmont
- Granite, Longmont
- Graphic Design Services, Longmont - Graphic Designer
- Graphic Designer & Artist Services, Longmont
- Grease Traps & Sand Traps Service, Longmont
- Greeting Card Stores, Longmont
- Grills & Grilling Equipment & Supplies, Longmont
- Grinding Services, Longmont
- Grocery Stores & Supermarkets, Longmont
- Ground Transportation, Except Passenger, Longmont
- Gun Repair & Services, Longmont
- Guns & Gunsmith Services, Longmont
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