The square mile (abbreviated as sq mi and sometimes as mi<sup>2</sup>) is an imperial and US unit of measure for area. One square mile is equal to the area of a square with each side measuring a length of one mile.
One square mile is equal to:
One square mile is also equivalent to:
Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square ( ÃÂ ) has an area of ; a rectangle of measuring ÃÂ also has an area of , but is not 20 miles square.
In the United States Public Land Survey System, "square mile" is an informal synonym for section.