Where to find industry code?
Industry code is a 6-digit code that corresponds to your main business activity and is required when completing Form T2125, Statement of Business or Professional Activities, form T2121, Statement of Fishing Activities, or Form T2042, Statement of Farming Activities.
Please check this link and find a suitable code related to the business activity from the complete list of North American Industry Classification System codes (NAICS) maintained by Statistics Canada.