Eventually, the boundaries of Markham occupied the area, as follows:
* NORTH: Whitchurch Town Line (Between 19th Avenue and Stouffville Side Road)
* SOUTH: Scarborough Town Line (Steeles Avenue)
* EAST: Pickering Town Line
* WEST: Vaughan Town Line (
Yonge Street)
......
At present Markham comprises several distinct communities: Markham Village, Cornell, Unionville, Wismer Commons, Milliken and
Thornhill.
Т.е. Thornhill - часть Маркхама, чуть шо

.
http://en.wikipedia.org/wiki/History_of ... m,_Ontario