I'm probably not getting what he said entirely right, but blogger Dave Schuler once pointed out that east of the Mississippi and north of Mason-Dixon, almost every city but NYC that isn't a state capital has lost population over the decades. DC, of course, is a national one.
https://twitter.com/AlecMacGillis/status/1425935414918094850
I can't find his post but here is his excellent blog (one of the best solo ones around): theglitteringeye.com
I found it. The claim was that they've lost population "since their peak" (which is kind of cheating, but pick a year from 1950 to 1970 and it holds directionally). theglitteringeye.com/downsizing-cit… 
Notably, in this map that's going around, you can see some of the state capitals (Columbus and Indianapolis in particular stick out) even as they are surrounded by population-bleeders.
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