Klemme, IA has a population of 572 and is the 18,737th largest city in the United States. The population density is 1,126 per sq mi which is 1961% higher than the Iowa average and 1143% higher than the national average. The median age in Klemme is 31 which is approximately 19% lower than the Iowa average of 38. In Klemme, 58% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 89% of Klemme residents were born in Iowa, 8% were born out of state, 2% were born outside of the United States and 1% were foreign born.