My Grandpa farmed 160 "acres" in southwest Kansas.  Interesting use of that unit of measurement, don't see that used much in the context of cities. I wonder how many people could define an acre without looking it up on their smart phone? FYI an arce is 1/640 of a square mile or 66 x 660 feet, a rather long rectangle, I'm guessing that makes more sense to farmers.  A more common measurement of density, is people per square mile.  Denver is around 4500.  For comparison; New York City (all boroughs) 27,000, San Francisco 17,000, even the spread out Los Angeles is around 8600 per square mile.  Denver has long long way to go to reach that kind of density.