Volcano, HI has a population of 2,511 and is the 9,826th largest city in the United States. The population density is 46 per sq mi which is 64% lower than the Hawaii average and 50% lower than the national average. The median age in Volcano is 58 which is approximately 51% higher than the Hawaii average of 39. In Volcano, 41% of the population over 15 years of age are married, 96% speak English and 0% speak Spanish. 56% of Volcano residents were born in Hawaii, 37% were born out of state, 2% were born outside of the United States and 5% were foreign born.