I see these false claims about size a lot, especially spread out huge Texas cities. A lot of people claim Dallas is bigger than DC but DC has way more people, especially if you add in Baltimore and or the millions driving down 95 every day.

I was recently in San Antonio and Austin. Both seem rather small compared to DC or Boston.

DC and Baltimore should effectively be added together into one hub and that puts it well into 3rd place and ahead of Dallas for actual urban areas.