State of New York, as in NYC. State of California, which definitely would mean Los Angeles. State of Texas, which would include Dallas/Ft. Worth. There's three that I can think of.
Pennsylvania surprises me, but I guess it's size overcomes its low density. And as crowded as the DC area is, I'm a little surprised that Virginia or Maryland did not make the list, since high-population cities seem to have put the others on the top.
In 2010 you were right, but Illinois lost population in the following 10 years and PA gained some, and passed Illinois per 2020 census https://en.wikipedia.org/wiki/List_of_states_and_territories_of_the_United_States_by_population
Cobbling together some data from Hoot's WIKI link and others, for the intellectually curious... I was wrong about Pennsylvania's relative land area. Note that the Land Area and Population Density ranks go up to 56, and there are sequential gaps. There were territories on that list that were not on the Population Numbers list that I merged the data into. Interesting that WIKI's lists are different.
But the difference is only 1.5% WIKI shows the April 1, 2020 census figures and a July 1, 2020 estimate. It shows Pennsylvania picking up 81,000 residents in that 3 month period, and Illinois losing 243,000!!! Heck, Illinois lost nearly 2% of its population just in those 90 days!!!!! I bet we could get a deal on some real estate, huh?