City of Markham | 35,109 followers on LinkedIn. Official LinkedIn of the City of Markham. Social media guidelines: markham.ca/social | Markham, Ontario is one of the most culturally diverse and fast growing cities in the Greater Toronto Region with a population of over 353,000 people. A multiple award-winning municipality celebrating its 220th anniversary, Markham is Canada’s High-Tech Capital anchored by 1,500+ technology companies that generate over 35,000 jobs. Of the 10,400 companies in Markham, there is a high concentration of Canadian head offices located here - including industry leaders such as IBM, Aviva Insurance, AMD, Allstate, The Miller Group, Parsons, Huawei Technologies, MMM Group, Lenovo, GE Energy, Bank of China, Toshiba, J+J, Hyundai and Honda.