I did. As of the 2010 census, the Sacramento metropolitan area had an estimated population of 2,461,780 -- less than half of your claimed 5 million.
http://en.wikipedia....tropolitan_area
Alone, Sacramento County rings in at 1,418,788.
http://quickfacts.ce...s/06/06067.html
http://www.news10.ne...?storyid=127274
City of Sacramento: 472,178
http://www.google.com/publicdata/explore?ds=kf7tgg1uo9ude_&met_y=population&idim=place:0664000&dl=en&hl=en&q=population+of+sacramento+city