Schofield Barracks, HI has a population of 20,330 and is the 2,139th largest city in the United States. The population density is 7,331 per sq mi which is 5656% higher than the Hawaii average and 7992% higher than the national average. The median age in Schofield Barracks is 22 which is approximately 42% lower than the Hawaii average of 39. In Schofield Barracks, 60% of the population over 15 years of age are married, 80% speak English and 11% speak Spanish. 11% of Schofield Barracks residents were born in Hawaii, 77% were born out of state, 6% were born outside of the United States and 6% were foreign born.