According to the Census Bureau it is... I think you're right on Minneapolis, but I did some digging on the Census website... (because now I'm curious)...
Minneapolis' metro area (including St. Paul) was about 2.96 million in 2000. San Antonio's was just over 1.7 million... however, if you include Austin (1.25 million) then the metro areas are roughly the same. San Antonio and Austin's downtowns are roughly 75 miles apart, but in the next 20-30 years they'll most likely merge into 1 huge metro area.
Yeah. Minn. & St. Paul and the suburbs are genuinely the same city geographically. Including Austin with SA makes a little sense, but they are really distinct. It'd be like including Hartford in NYC. They're close enough that fans travel on occasion and it's close enough for TV, but the smaller city is far enough away to make travel a tad prohibitive.