Kahuku is a census-designated place (CDP) in the Koolauloa District on the island of Oahu, County of Honolulu, Hawaii, United States. In the Hawaiian language, ka huku means "the projection", presumably a reference to Kahuku Point nearby, the northernmost point of land on the island of Oahu. As of the 2010 Census, Kahuku had a population of 2,614.
Kahuku is located at 21°40′49″N 157°57′1″W. This community is located northwest from Laie and east from Kuilima and Kawela Bay along Kamehameha Highway (Route 83).
According to the United States Census Bureau, the CDP has a total area of 2.3 square miles (6.0 km2), of which 1.0 square mile (2.6 km2) is land and 1.3 square miles (3.4 km2) is water. The total area is 57.46% water, the Pacific Ocean lying off the coast in the census tract.
As of the census of 2000, there were 2,097 people, 509 households, and 401 families residing in the CDP. The population density was 2,150.9 people per square mile (834.7/km2). There were 518 housing units at an average density of 531.3 per square mile (206.2/km2). The racial makeup of the CDP was 11.06% White, 0.29% Black or African American, 0.14% Native American, 26.85% Asian, 27.28% Pacific Islander, 1.05% from other races, and 33.33% from two or more races. 8.63% of the population were Hispanic or Latino of any race.