The town has a total area of 71.9 square miles , according to the United States Census Bureau . According to the United States Census Bureau , the town has a total area of 71.9 square miles ( 186.3 kmÂ ) , of which , 69.5 square miles ( 180.0 kmÂ ) of it is land and 2.5 square miles ( 6.4 kmÂ ) of it ( 3.42 % ) is water .