I was questioning the too. Looks like it just barely clears the million mark, because it is urban area it including Council Bluffs, Elkhart, Fremont, etc.
Love that the #1 city is fourth from the bottom in percentage correct. Made for a real head slapper for me when time ran out and it was the only one I couldn't guess.
Update 2023. Of the 56 areas with a population over 1 million, the least educated are: Fresno, El Paso, and Las Vegas.
Edit: Jeez, and you too.