UPDATED: The 1940 US census became available today for browsing on 1940census.archives.gov. Other sites began posting the record images as early as 12:01 a.m.. Here’s what’s online now:
FamilySearch (browse records here)
- Available (though I’m not sure whether all records have been uploaded for these states): Colorado, Delaware, Virginia, Kansas, Virginia, Oregon
Ancestry.com (See a progress chart)
- In process: California, New York, Pennsylvania, Virginia
MyHeritage.com (see the 1940 census page here): No information available yet.
FindMyPast.com (here’s the 1940 census page): No information available yet.