Discovery Harbour, HI has a population of 1,128 and is the 14,409th largest city in the United States. The population density is 317 per sq mi which is 149% higher than the Hawaii average and 250% higher than the national average. The median age in Discovery Harbour is 45 which is approximately 17% higher than the Hawaii average of 39. In Discovery Harbour, 69% of the population over 15 years of age are married, 84% speak English and 1% speak Spanish. 36% of Discovery Harbour residents were born in Hawaii, 49% were born out of state, 2% were born outside of the United States and 13% were foreign born.