This article is about the unit of measure. In England, the Square Mile is a traditional name for the City of London.

A square mile (symbol sq. mile or mi˛) is an imperial unit which is the area of a square whose side is one mile (or 5,280 feet). A square mile is equal to 27,878,400 square feet, 640 acres, or roughly 2˝ square kilometres (2.589988 km˛, to be more exact). In the Public Land Survey System of the US and the Dominion Land Survey of Canada, the size of a standard section of land is one square mile. Note that the abbreviation sq. mile is more common than mi˛, as the use of a superscript 2 to indicate a squared unit is more common with SI units.

Persons per squaremile is the average number of inhabitants per squaremile of land area.

These figures are derived by dividing the total number of residents by the number of squaremiles of land area in the specified geographic area.

Land area measurements are originally recorded as whole square meters (to convert square meters to square kilometers, divide by 1,000,000; to convert square kilometers to squaremiles, divide by 2.58999; to convert square meters to squaremiles, divide by 2,589,988).

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