With the completion of the 1940 census index there now are more than 713 million U.S. Federal Census records online and fully searchable from 1790 through 1940. To celebrate this unprecedented access to all publicly available censuses, Ancestry.com a great offer for you
Search all U.S. Censuses free
From August 29th through September 3rd, Ancestry.com is opening all of its U.S. census records – FREE.
You can also search these free records on Ancestry.ca during the same time period.