in a recent thread there were discussions around the advantage some cities have with large city limits making their city look very impressive on paper when it comes to city-proper population numbers.
one of the most prime examples of this is Houston with a land area of 640.4 sq. miles and a 2020 population of 2,304,580 (4th largest municipality in the nation).
if my hometown of chicago was allowed to annex itself out to 640 sq. miles, it might look something like this:
the yellow townships on the map of cook county above represent ~638 sq. miles and contain a total of 4,586,684 people.
so how about your city? what would its population be at ~640 sq. miles?