Hilo is classified by the United States Census Bureau as a census-designated place ( CDP ) , and has a total area of , of which is land and of which ( 7.10 % ) is water .
Hilo is classified by the United States Census Bureau as a census-designated place ( CDP ) , and has a total area of 58.4 sqmi , 54.3 sqmi of which is land and 4.2 sqmi of which ( 7.10 % ) is water .