Hilo is the largest settlement in Hawaii County, Hawaii, United States, which encompasses the Island of Hawaii, and is a census-designated place. The population was 44,186 according to the 2020 census. It is the fourth-largest settlement in the state of Hawaii and largest settlement in the state outside of Oahu. Hilo is the county seat of the County of Hawaiʻi and is in the District of South Hilo.