Barrie is a city in central ontario, canada, on the western shore of lake simcoe. although located in simcoe county, the city is politically independent. barrie is within the northern part of the greater golden horseshoe, a densely populated and industrialized region of ontario. in 2011 census, the city's population was originally reported as 135,711, making it the 34th largest in canada. the city's 2011 population was subsequently revised to 136,063.