There's multiple confusing metropolitan areas, depending on what you want to count. See: https://en.wikipedia.org/wiki/San_Francisco_Bay_Area https://en.wikiped

There's multiple confusing metropolitan areas, depending on what you want to count. See: https://en.wikipedia.org/wiki/San_Francisco_Bay_Area https://en.wikipedia.org/wiki/San_Francisco_Bay_Area which lists it at 7.44 million. The 4.5 million is for San Francisco-Oakland-Hayward, which notably excludes San Jose and things more associated with that part of the area.