Do you know that our voter registration, which is organized by state and ultimately administered at the county level, does include that information?
Also, have you considered how a mapping to an address would have helped in this case between two homeless people?
> It’s a miracle people can get their mail in the US (and I know a whole neighborhood on Hawaii that can’t!)
Did a quick web search because this seemed dubious. I think you're referring to a neighborhood that uses PO boxes. They absolutely can and do still "get their mail," they just need to go down the street for it instead of having it dropped 10 feet away from their front door. Less convenient, but not as if the system isn't there, and it would be trivial to have a mail carrier fill in that last half-mile if it made since for that community.