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Originally Posted by marothisu
Anyway, my own theory on this has to do with last Census. All indications are that the city population was very undercounted. I believe some people said by even as much as 100k or 200k people. It is very possible 250K people left Illinois but doesn't look like it due to undercounting in 2010. We'll probably never know for sure though.
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I was heavily involved in our local census count effort for 2020.
Speaking at least for this little slice of Cook County, the self-response rates among Hispanics and working class/lower-income renters were exceedingly low. Like, 50-60%.
And the Census Bureau did not inspire confidence in the level of organization and reporting for the door-to-door follow-ups that started in summer time. Even if the the door-to-door operation had been a model of Swiss efficiency and precision, the pandemic made face-to-face contact and intercepts that much more difficult.
We have hundreds of semi-formally subdivided 2-flats, 3-flats and apartments over storefronts (semi-formal = no separate address with the post office, no history of building permits, etc.) and could never get confirmation from the CB as to whether they incorporated our supplementary info for their in person follow-ups.
It'll be impossible to say for sure until place-, tract-, or block-level counts are released, but until seeing those, and being able to reality check against other data points like school enrollments, water billings, and block-by-block intel, I'm going to be skeptical of the counts in any places that have large proportions of the above populations.