Aiea is a census-designated place (CDP) located in the City and County of Honolulu, Hawaii, United States. As of the 2010 Census, the CDP had a total population of 9,338.GeographyAiea is located at . According to the United States Census Bureau, the CDP has a total area of 1.8sqmi, of which, 1.6sqmi of it is land and 0.1sqmi of it is water.Kamehameha Highway divides most of Aiea from the shore of Pearl Harbor, and the parallel major thoroughfare, Interstate H-1, further cuts the town's commercial district into two distinct areas. These east-west routes connect Aiea to Pearl City, immediately adjacent on the west, and Halawa, adjacent on the east. The residential area known as Aiea Heights extends up the ridgeline above the town. The communities of Newtown Estates and Royal Summit are located at the western edge of Aiea near its border with Pearl City at Kaahumanu Street. Residents of the census-designated places of Waimalu and Hālawa use Aiea in their postal address.History"Aiea" was originally the name of an ahupuaa, or Hawaiian land division. The name was derived from a species of plant in the nightshade family, Nothocestrum latifolium. It stretched from Aiea Bay (part of Pearl Harbor) into the mountains to the north. At the end of the 19th century, a sugarcane plantation was opened in the district by the Honolulu Plantation Company.