40,000?
I thought Manhattan had a lot more people?
point: how does anyone trust census counts in urban hell-hole places.
so much fraud must go on, and identies of people who dont really exist could very well be much more than half of the 'post boxes'.
if you have control of a local post office you can grow your little appartment building complex into something gigantic, and maybe be able to 'buy your own' congress critter.
(the preceeding is a quasi-fictionalized account of how corrupt cities seem to be. There may not just be corrupt cities, but also corrupt 'appartment house' havens all over america.
where ever there is a stand of post boxes there ist he potential for major fraud of many different kinds. As long as you have control of the local post offices.