640 acres per square mile.
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One square mile is 640 acres.
640 acres in a square mile
There are 640 acres in one square mile. So, just multiply the number of square miles by 640 to get acres.
One square mile = 640 acres.
A square mile is 3,097,600 square yards and one acre is 4840 square yards, so there are 640 acres (3,097,600/4840) in a square mile.