I think you re both right We must follow what sources say if you want to put in a rounded number and make up some error bars but the source gives an exact number that s a Bad Thing However we do also have to be pragmatic population varies over time most ways of counting have potential inaccuracies and we should be open on that point So what do the sources say An archived link is hardly ideal so I went looking The 2010 census says 24 658 823 The UN estimates 24 392 000 in 2010 Should we show both to readers Or if we just said something like 24 658 823 2010 census then readers are still being reminded that the number may be slightly out of date and that it s a census result which is a pretty good source but might have certain limitations