Woodstock is a city in Southwestern Ontario, Canada. The city has a population of 40,902 according to the 2016 Canadian census. It is now one of the largest cities in Southwestern Ontario. Woodstock is the seat of Oxford County, at the head of the non-navigable Thames River, approximately 128 km from Toronto, and 43 km from London, Ontario. The city is known as the Dairy Capital of Canada and promotes itself as "The Friendly City".