On April 2, 2012, the National Archives will release the records of the 1940 Census. The only place they will be available is the web site http://1940census.archives.gov/ There is no name index available yet. Volunteers from many genealogy organizations are working to prepare this index but the project will take several months. Therefore, in order to find the record for a particular family, a researcher must know where that family lived in 1940 and from that information determine the enumeration district that included that address. For more information on locating that enumeration district, please look at the web site prepared by Steve Morse http://stevemorse.org/census/unified.html. He has prepared search engines for many large cities and other areas. FamilySearchhas some states and so does My Heritage.