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Reclaim the Records recently won a case for the New York State death index to be released to cover through 2017.  This will only be records outside of New York City, but they will be asking for New York City too.  Currently, the New York state death index is only available from 1880 through 1972.  This new index also may include more data fields than have ever been released before.

https://www.reclaimtherecords.org/records-request/32/

This is a brand new mini-website we just launched, with more than ten and a half million records, indexing the basic genealogical data from New York State death records from 1880-2017! This is the first time that any New York State death data from 1973-2017 has been available anywhere, on any website or from any source. It's also the first time that the 1957-1971 records for New York finally include the actual places of death, not just the 'place of residence' field. (This is super-important info if you want to try ordering a death record from a town clerk, instead of waiting in a five-year backlog with the state DOH in Albany.)

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=en

this 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.