The answer depends on the south of WHAT!
USA - 3,717,811.29 square miles.
The size of the USA is 3,717,813 square miles, including its territories.
USA - 3,717,811.29 square miles.
Dover, Delaware, USA - 22.7 square miles.
Maine, USA - 35,387 square miles (ranked 39th in size).
Oregon, USA is ranked 9th in size with 98,386 square miles.
Florida, USA - 65,758 square miles.
Oregon, USA - 98,466 square miles.
USA - 3,717,811.29 square miles.
Indiana, USA, has a total area of 36,418 square miles (ranks 38th in size).
Missouri, USA - 69,704 square miles.
Clay County, Alabama, USA - 606 square miles.