Archives Canada have 1871 & 1881 (LDS have 1881 also)http://www.collectionscanada.gc.ca/databases/census-1871/ind...
If you go to Cyndi's list, a very good site for Canada & US censuses.http://www.cyndislist.com/canada/census/1871/
And there may be more.
The US census for 1940 will be available Apr 2/2012
How come Canada is so out dated?