The 1940 census is on it's way. Then there is the city directory for the city your ancestors lived in. IF you can, look into Ancestry.com. The library and FHL libraries have free access to ancestry.com also.
I had a lot of luck doing this from 1930-1950 Directories. I followed my family surnames in the directory. They will give the first name of the spouse living in the household, occupation of the head of household, address and name of place employed AND when you see the letter 'c', you know you are looking at colored folks info.
I couldn't find a death year for a gruncle. I followed his name and address from 1920-1935. I knew his mother my grgrandmother lived in the household. When I found a year where only her name was at a known address, I was able to zoom in on a death year. I ordered the death certificate for the gruncle. I was also able to figure out where she went, after this sons death--to his sons home.