How many acres are in a section of land?

A section of land is defined as a square mile, which is equivalent to 640 acres. This standard measurement is used in the United States to describe land parcels, particularly within the context of the Public Land Survey System. Each section is typically subdivided into smaller units, but the total area of one section remains consistently at 640 acres. This is why the correct answer is 640 acres, making it an essential fact for understanding land measurements in agricultural and real estate contexts.