Blairstown, IA has a population of 744 and is the 17,089th largest city in the United States. The population density is 1,348 per sq mi which is 2367% higher than the Iowa average and 1387% higher than the national average. The median age in Blairstown is 35 which is approximately 7% lower than the Iowa average of 38. In Blairstown, 71% of the population over 15 years of age are married, 88% speak English and 12% speak Spanish. 80% of Blairstown residents were born in Iowa, 17% were born out of state, 0% were born outside of the United States and 3% were foreign born.