A lot.
If they stood next to each other with an arms length between and in front to back of them, they would take up about 40 square feet each. 80 square miles is 80x80x5280x5280 sq ft = 17,840,000,000 sq ft; divide by 40 is 4.5 billion people - pretty much the population of the whole earth!
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80 to 135 people
80 miles = 422,400 feet.
80 miles = 5068800 inches
80 miles = 128.75 km
80mph = 80 miles/hour If you drive for one hour at 80 miles/hour, you will travel 80 miles.