Peosta, IA has a population of 1,881 and is the 11,387th largest city in the United States. The population density is 757 per sq mi which is 1285% higher than the Iowa average and 735% higher than the national average. The median age in Peosta is 32 which is approximately 17% lower than the Iowa average of 38. In Peosta, 73% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 73% of Peosta residents were born in Iowa, 25% were born out of state, 1% were born outside of the United States and 1% were foreign born.