Reinbeck, IA has a population of 1,765 and is the 11,761st largest city in the United States. The population density is 811 per sq mi which is 1324% higher than the Iowa average and 796% higher than the national average. The median age in Reinbeck is 45 which is approximately 18% higher than the Iowa average of 38. In Reinbeck, 69% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 81% of Reinbeck residents were born in Iowa, 17% were born out of state, 0% were born outside of the United States and 1% were foreign born.