Ancestry has just added the Canadian Census records for 1861, 1871 and 1881. Though available before elsewhere, these are now more readily available through Ancestry.ca.
Remember that in most public libraries Ancestry (library edn) is available free.
Local Durham Region libraries with Ancestry:
. . Ajax Public Library
. .Brock Township Public Libraries
. .Clarington Public Library
. .Oshawa Public Libraries,
. .Pickering Public Library,
. .Whitby Public Libraries,
. .Barrie Public Library,
. .North Kawartha Public Library,
. .Toronto Public Libraries.
N.B. Call smaller branches to ensure they have Ancestry at that location, even when the main branch does.