I was fortunate in having an exact address for my family in 1940. My family moved to Michigan in 1936 with my older sister and she remembered the address. With that I was able to go to the Steve Morse site (what a wonderful, helpful site) and find the exact ED district. I then went to the Ancestry.com site and inputed the ED district and was able to browse page by page until I found my family. We were warned way ahead of time that the 1940 Census could not be indexed for some time. I just consider us fortunate to be able to access the images, even without indexing. Thank you Ancestry.com.