Heyburn, ID has a population of 3,187 and is the 8,504th largest city in the United States. The population density is 1,221 per sq mi which is 6299% higher than the Idaho average and 1248% higher than the national average. The median age in Heyburn is 28 which is approximately 22% lower than the Idaho average of 36. In Heyburn, 59% of the population over 15 years of age are married, 74% speak English and 25% speak Spanish. 54% of Heyburn residents were born in Idaho, 36% were born out of state, 0% were born outside of the United States and 9% were foreign born.