Note that the about 23% of the population is under 18 (possibly zero or reduced BI), and 14.5% is 65 or older (possibly offset by SS). Also, since the census

Note that the about 23% of the population is under 18 (possibly zero or reduced BI), and 14.5% is 65 or older (possibly offset by SS). Also, since the census is tasked with counting all people in the united states, it also includes non-citizen long-term visitors and illegal (or undocumented) immigrants. So it's not quite as simple as latest census count * 10k. It's still quite a lot though.