As a followup to a post comparing the population densities of Manhattan and Brooklyn to those of San Francisco and Oakland (not even close): if San Jose (945,942, 2,000/km2) had the density of Staten Island (468,730, 3,151.8/km2), San Jose would have 1,490,710 residents.
Another bit of San Jose trivia, which I’ve meant to blog ever since I briefly lived there (2005): it is the largest suburb in the U.S. As of 2000 (I haven’t seen newer), it was the only U.S. city with a population above 500,000 with an estimated daytime population significantly lower than its resident population (5.6% daytime population loss).
For ease of reference, the daytime population gains of New York City (obviously if broken out Manhattan’s would be far higher, and Staten Island’s far lower), San Francisco, and Oakland were 7%, 21.7%, and 2.7% respectively.