1940 Census Info

I've been asked to spread the word around about "For indexing purposes, Washington will be indexed in the City field and District of Columbia will be indexed in the State field for the residence fields.  Lots of indexers are getting this wrong.  If they're in the city of birth then both Washington and DC are included in the same field.  For both cases DC should be expanded to District of Columbia and correct the spelling if it's wrong." for 1940 Census