The New York Times published an article yesterday (“Cracking the Brand-New 1940 Census”), reporting that at the New York Public Library’s Milstein Division of United States History, Local History and Genealogy and the NYPL Labs have connected 1940 phone books to the 1940 census to help researchers locate New Yorkers in the 1940 US Census.
This is a wickedly intelligent way to concatenate available data.
The database allows you to start with a name and a borough, find the person in the telephone directory, use that to find the address, then use the address to find the 1940 US Census enumeration district. The site guides you through the process, including sending you over to FamilySearch to information on the Enumeration District you have discovered.
This will provide quite a bit of help for researchers who still have not found family members in the 1940 US Census, either because the names are indexed incorrectly, or because there are “too many hits.”