. From northernmost, clockwise; North and South Kohala, Hāmākua, North and South Hilo (highlighted), Puna, KaOkinaū, North and South Kona.]] Hilo is the second-largest CDP in the State of HawaiOkinai and the largest settlement on the island of HawaiOkinai with a population of 43,263 during the 2010 census. Hilo is the county seat of HawaiOkinai County, HawaiOkinai, and is situated in the South Hilo District. The town overlooks Hilo Bay, and is near two shield volcanoes, Mauna Loa, considered active, and Mauna Kea, a dormant volcano upon which some of the best ground-based astronomical observatories are placed. Hilo is home to the University of HawaiOkinai at Hilo, OkinaImiloa Astronomy Center of HawaiOkinai, as well as the Merrie Monarch Festival, a week-long celebration of ancient and modern hula, which takes place annually after Easter. It is also home to the Mauna Loa Macadamia Nut Corporation, one of the world's leading producers of macadamia nuts. It is served by Hilo International Airport, inside the CDP. [more on Wikipedia]