To calculate square feet you need both a length and a width.
1 mile is equal to 5,280 linear feet. One square mile (1 mile x 1 mile) is equal to 27,878,400 square feet.
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223,000,000 square feet.
1 square mile = 27,878,400 square feet.
Since a mile is 5280 ft, a square mile contains 5280x5280=27,878,400 square feet. That is almost 28 million square feet.
1,320 feet equal one fourth of a mile
1 square mile = 27,878,400 square feet.