Postville, IA has a population of 2,281 and is the 10,301st largest city in the United States. The population density is 1,081 per sq mi which is 1878% higher than the Iowa average and 1093% higher than the national average. The median age in Postville is 28 which is approximately 27% lower than the Iowa average of 38. In Postville, 67% of the population over 15 years of age are married, 49% speak English and 35% speak Spanish. 48% of Postville residents were born in Iowa, 20% were born out of state, 1% were born outside of the United States and 31% were foreign born.