- Ice Cream & Frozen Yogurt, Gardnerville
- Imported Auto Parts, Gardnerville
- Industrial & Commercial Cleaning Services & Companies, Gardnerville
- Industrial & Commercial Real Estate, Gardnerville
- Industrial & Heavy Equipment Repair & Service, Gardnerville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Gardnerville
- Industrial & Personal Service Paper, Boxes & Cardboard, Gardnerville
- Industrial Contractors, Gardnerville
- Industrial Equipment & Machinery, Gardnerville
- Industrial Goods & Products - Hard Goods - Large, Gardnerville
- Industrial Goods & Products - Hard Goods - Small, Gardnerville
- Industrial Goods & Products - Soft - Large & Small, Gardnerville
- Industrial Heaters & Boilers, Gardnerville
- Industrial Lifts, Gardnerville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Gardnerville
- Industrial Maintenance & Cleaning Contractors, Gardnerville
- Industrial Pump Repair & Service, Gardnerville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Gardnerville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Waste Disposal, Gardnerville
- Industrial Waste Recycling, Gardnerville
- Industry, Gardnerville
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- Information Bureaus & Services, Gardnerville
- Information Retrieval Services, Gardnerville
- Inspection & Testing Services, Gardnerville
- Insulation Contractors, Gardnerville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Gardnerville
- Insurance Carriers, Gardnerville
- Insurance Consulting & Information Services, Gardnerville
- Insurance Farm, Gardnerville
- Insurance General Liability, Gardnerville
- Insurance Motorcycles, Gardnerville
- Insurance Renters, Gardnerville
- Insurance Services, Gardnerville
- Interior Designers, Gardnerville
- Interior Designers & Decorators, Gardnerville
- Internal Medicine Doctors, Gardnerville - Internists Physicians & Surgeons
- Internet Services, Gardnerville
- Investment Management Services, Gardnerville
- Investment Services & Advisors, Gardnerville
- Iron, Steel & Metal Fabricators, Gardnerville - Fabrication Companies
- Italian Restaurants, Gardnerville
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