Kitchener is a city in the Canadian province of Ontario, about 100 km (62 mi) west of Toronto. It is one of three cities that make up the Regional Municipality of Waterloo and is the regional seat. Kitchener was known as Berlin until a 1916 referendum changed its name. The city covers an area of 136.86 km², and had a population of 256,885 at the time of the 2021 Canadian census.