Hazleton, IA has a population of 794 and is the 16,654th largest city in the United States. The population density is 1,065 per sq mi which is 1850% higher than the Iowa average and 1076% higher than the national average. The median age in Hazleton is 36 which is approximately 5% lower than the Iowa average of 38. In Hazleton, 52% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 86% of Hazleton residents were born in Iowa, 14% were born out of state, 0% were born outside of the United States and 0% were foreign born.