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Gumburcules t1_ja9svyj wrote

> This is the number of people between the ages of 18 and 24 moving into the city from a different state.

I'm guessing this is the reason, since someone who grew up in Bethesda or Fairfax is getting counted whereas someone who grew up in Evanston or Long Island and moves to Chicago or NYC isn't.

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SamTheGeek t1_jab7z89 wrote

ACS data also is an incomplete survey which misses a lot of relocations, particularly of those during and immediately after college (so, all the Gen-Z relos and some millennial ones). A lot of the data is inferred from USPS mail-forwarding and other voluntary data sources — many young people don’t change their mailing addresses formally or switch their driver’s licenses (if they have them).

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