For most small cities, the 1920 ED numbers (as well as the 1930 ED numbers) can be found
directly with this utility. In that case, after you select the state you would select the
city, and a set of ED numbers for that city will be displayed. If it really is a small
city, there won't be many EDs and you can easily search through each one looking for the
address that you want.
For larger cities, this utility will let you obtain the 1920 ED number of an address if you
already know the ED number of that address in the 1930 census. The 1930 ED number can be
obtained using the One-Step tool at
http://stevemorse.org/census. Once you obtain the
1930 ED number with that tool, you will be presented with a button that links you back to
this utility to do the conversion.
For all other areas, you would again use this utility to convert the 1930 ED number to the
1920 one, but in this case you would get the 1930 ED number from the One-Step
ED Definition tool at