Oh, please. You still haven't explained how such information is useful, just that you think the gubmint should have it.
The other side of it is that the question def narrows the field should congress change the law to use such info for immigration purposes. There were only ~13.2M LPR's in the country in 2014, considerably narrowing the field from over 315M.
https://www.dhs.gov/sites/default/files/publications/LPR Population Estimates January 2014.pdf
I just want the most accurate Constitutionally mandated count we can get. Period. You clearly do not & you can't even tell us why other than you want what you want for undisclosed reasons. The reasons he GOP wants an under count in blue metro areas are obvious, however. They neither need nor want honest Democracy & have demonstrated that time & time again with extreme gerrymandering & various forms of vote suppression.
Hell- you'd think they know that Americans aren't dumb enough to provide them with an honest majority so they'll just create a fictional post-truth majority instead.