Coquitlam is a city in the Lower Mainland of British Columbia, Canada. Mainly suburban, Coquitlam is the sixth-largest city in the province, with a population of 148,625 in 2021, and one of the 21 municipalities comprising Metro Vancouver. The mayor is Richard Stewart. Simon Fraser explored the region in 1808, encountering the Indigenous Coast Salish peoples. Europeans started settling in the 1860s.