Regional Municipality of Waterloo

The Regional Municipality of Waterloo (Waterloo Region or Region of Waterloo) is a metropolitan area of Southern Ontario, Canada. It contains the cities of Cambridge, Kitchener and Waterloo (KWC or Tri-Cities), and the townships of North Dumfries, Wellesley, Wilmot and Woolwich. Kitchener, the largest city, is the seat of government.

The region is 1,370 square kilometres (530 sq mi) in area, with a population of 587,165 as of the 2021 Canada census, though an end of 2023 estimate puts the population above 673,910 people. Waterloo Region forms the tenth-largest metropolitan area in Canada, with recent population growth almost entirely fuelled by international students.

The region was formerly called Waterloo County, created in 1853 and dissolved in 1973. The county consisted of five townships: North Dumfries, Waterloo, Wellesley, Wilmot, and Woolwich.

Early Archaic hunters of the Bifurcate Base tradition were present in the area around 8300 years ago. They occupied the Kassel site (AiHd-71), a base camp, and the Blue Dart site (AiHd-89), which was likely a kill site; this followed typical hunter-gatherer occupation patterns.

Up to the 17th century, the Attawandaron (Neutral) nation inhabited the Grand River area. European explorers admired their farming practices.

In the wake of a smallpox epidemic and European incursions, the Haudenosaunee (Iroquois) and the Wendat (Huron) Confederacies waged war from 1642 to 1650. Invasion by the Haudenosaunee's Seneca and Mohawk nations ended Attawandaron independence.

In 1784, in recognition of Haudenosaunee support during the American War of Independence and the consequent loss of its land in New York state, the British government granted the Grand River valley to the Confederacy. The latter settled in the lower Grand River Valley, the present Brant County, and sold land in the upper Grand, now part of Waterloo Township, to Loyalist Colonel Richard Beasley. In 1816, William Dickson, a Scottish-born land speculator, acquired 90,000 acres (360 km²) along the Grand River, in present North and South Dumfries Townships, and the city of Cambridge.

Dickson planned to divide the tract into lots to sell to Scottish settlers. He and American-born miller, Absalom Shade, chose the confluence of Mill Creek and the Grand River to found Shade's Mills. In 1825, the growing settlement had a post office.