Wainiha, HI has a population of 172 and is the 25,095th largest city in the United States. The population density is 72 per sq mi which is 44% lower than the Hawaii average and 21% lower than the national average. The median age in Wainiha is 37 which is approximately 3% lower than the Hawaii average of 39. In Wainiha, 53% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 43% of Wainiha residents were born in Hawaii, 53% were born out of state, 2% were born outside of the United States and 1% were foreign born.