Frederika, IA has a population of 301 and is the 22,490th largest city in the United States. The population density is 849 per sq mi which is 1455% higher than the Iowa average and 837% higher than the national average. The median age in Frederika is 31 which is approximately 19% lower than the Iowa average of 38. In Frederika, 61% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 90% of Frederika residents were born in Iowa, 10% were born out of state, 0% were born outside of the United States and 0% were foreign born.