The Bogdan's at the top of your list are the only ones I had time to look for that morning. I did look for Bogdan's in 1920 last night - nothing so far. In 1910 they were in Central Falls. And IF that RI Death and Burial record for that Stanley Bogdan baby that died in 1916 is theirs, then they were still in Central Falls as late as 1916.
I checked City Directories for a clue as to where they may have been during the 1918-1921 time frame, nothing yet. I found them in City Directories for other time frames, but not the 1920 time frame...
Is 'Bogdan' a shortened version of something else, like 'Bogdanowiz' or something and they could therefore maybe be listed in 1920 under their original Polish surname?
More later, I'm off to work,