Waipiʻo is a census-designated place located in the U.S. state of Hawaii. It is within Honolulu County in the Ewa District. It has a total area of 1.2 square miles at 21°25′5″N 157°59′53″W. The elevation is 381 feet above sea level. As of the 2010 census data, it had a total population of 11,674. The population density was 9,700/sq mi. Estimated per capita income in 2016 was $34,880. It has Zip code 96738.