Heflin, AL has a population of 3,489 and is the 8,060th largest city in the United States. The population density is 217 per sq mi which is 136% higher than the Alabama average and 139% higher than the national average. The median age in Heflin is 39 which is approximately 1% higher than the Alabama average of 39. In Heflin, 53% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 65% of Heflin residents were born in Alabama, 33% were born out of state, 1% were born outside of the United States and 1% were foreign born.