- Ice Rinks, Castlegar
- Ice Sports Clubs & Instruction, Castlegar
- Indian Restaurants, Castlegar
- Industrial & Commercial Real Estate, Castlegar
- Industrial & Heavy Equipment Repair & Service, Castlegar
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Castlegar
- Industrial & Personal Service Paper, Boxes & Cardboard, Castlegar
- Industrial Contractors, Castlegar
- Industrial Equipment & Machinery, Castlegar
- Industrial Goods & Products - Hard Goods - Large, Castlegar
- Industrial Goods & Products - Hard Goods - Small, Castlegar
- Industrial Goods & Products - Soft - Large & Small, Castlegar
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Castlegar
- Industrial Pumps, Castlegar - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Castlegar
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- Industry, Castlegar
- Inspection & Testing Services, Castlegar
- Insulation Contractors, Castlegar - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Castlegar
- Insurance Brokers, Castlegar
- Insurance Carriers, Castlegar
- Insurance Services, Castlegar
- Interior Designers, Castlegar
- Interior Designers & Decorators, Castlegar
- Internet Providers, Castlegar
- Internet Services, Castlegar
- Investment Services & Advisors, Castlegar
- Irrigation Systems & Equipment, Castlegar
- Italian Restaurants, Castlegar
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