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Originally Posted by IrishIllini
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Yes, it's a revision upward. Meaning Illinois officially on the books gained something like 30K people between 2010 and 2020. There may be way more but this revision upward is based on legitimate hard data that they missed many entire group quarter settings in the count (i.e. senior homes).
Contrary to what some people will say, it has nothing to do with migrants coming either. This is people they missed who were living in Illinois in 2020. The migrant stuff didn't start until after that and has nothing to do with this revision upward.
It also means that knowledge of these quarters that were missed in 2020 will be added to future estimations for the state (and whatever county, city, etc they're in) and will probably contribute to other upward revisions for post 2020 estimates.