ʻEwa Beach or simply ʻEwa is a census-designated place located in ʻEwa District and the City & County of Honolulu along the coast of Māmala Bay on the leeward side of Oʻahu in Hawaii. As of the 2010 Census, the CDP had a total population of 14,955. The U.S. postal code for ʻEwa Beach is 96706.