the 1940 Address was 222 42nd St, Ward 7, Moline
here is a Robert Davis, w daughter Mary at 3159 23rd Ave, Ward 7 in 1930
1930 Moline, 3159 23rd Avenue, Ward 7
Robert Davis, 55, age at 1st marriage: 25
Mary Davis, 17
Only those details match what we know. All birth places, theirs and their parents, say Illinois, not the correct ones.
https://www.familysearch.org/ark:/61903/1:1:XS11-GKS?lang=enthis census has been user corrected at ancestry to match the Robert L Davis we are looking for. - for what it's worth. It might just be someone trying to make things fit.
but the 2 locations are only a few blocks from each other. disregard the directions on Google maps when starting at 3159 23rd st. They take you to 222 42nd St, East Moline.