Waimea, HI has a population of 10,770 and is the 3,731st largest city in the United States. The population density is 274 per sq mi which is 115% higher than the Hawaii average and 203% higher than the national average. The median age in Waimea is 36 which is approximately 8% lower than the Hawaii average of 39. In Waimea, 58% of the population over 15 years of age are married, 66% speak English and 1% speak Spanish. 63% of Waimea residents were born in Hawaii, 30% were born out of state, 1% were born outside of the United States and 5% were foreign born.