Designated & Listed Houses and Buildings of Thornhill

Markham and Vaughan registers of historic properties:

Markham (City of Markham)

Vaughan (City of Vaughan)

Ontario Heritage Act Register (Source: Ontario Heritage Trust)

Built to Last: Heritage Properties from York County to York Region [Images and descriptions of York Region heritage properties plotted on the 1860 map of York County] (York Region, 2017).