Hau?ula is a census-designated place and rural community in the Ko?olauloa District on the island of O?ahu, City & County of Honolulu. There is a small commercial center. As of the 2010 Census, the CDP population was 4,148. A fringing reef extends off the shoreline. There are several beaches and beach parks in Hau?ula, including Hau?ula Beach Park, ?Aukai Beach Park, Kokololio Beach Park, and Mahakea Beach. Sugarcane was once grown along the narrow coastal plain inland from the highway. According to the United States Census Bureau, Hau?ula has a total area of 1.9 square miles (5.0 km2). 1.2 square miles (3.0 km2) of it is land, and 0.77 square miles (2.0 km2) of it, or 40.56%, is water, referring to a part of the Pacific Ocean included in the census tract.