Calmar, IA has a population of 1,023 and is the 15,006th largest city in the United States. The population density is 925 per sq mi which is 1592% higher than the Iowa average and 920% higher than the national average. The median age in Calmar is 33 which is approximately 13% lower than the Iowa average of 38. In Calmar, 57% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 80% of Calmar residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 1% were foreign born.