Between 2020 and 2021, so right when the pandemic hit, Manhattan alone lost $16 billion of federally-taxable income, according to this recent study by Economic Innovation Group. And San Francisco saw net migration that reduced its federal income tax base by more than $8 billion. At the time, this represented about a 20% decline.

Now, I don't know to what extent this maybe changed, slowed, or reversed from 2021 to today, but the IRS tax data is pretty clear: the pandemic accelerated a longstanding trend of Americans moving out of older coastal cities toward newer, sunnier, and more sprawling cities in the sun belt and in the Mountain West region.

Here is a map from EIG showing the difference in incomes between households moving in and moving out of each US county. A dark blue county means that the people who moved in were richer than the people who left. (For an interactive version, click through to their website.)

To give two examples. Here is San Francisco County, which lost nearly 20,000 people with average incomes of around $240,000 per year.

And here is Summit County, Utah (home of Parkview Mountain House in the Mountain West region), which saw 81 new tax returns and an average newcomer income of $395,000 per year.

This is an important reminder that people -- especially people of means -- vote with their feet. If they stop liking a place, they will leave, along with their incomes, to somewhere else. Indeed, in the case of this IRS data, the income flows to these growth regions seem to have been largely driven by upper-income households.