Coggon, IA has a population of 774 and is the 16,825th largest city in the United States. The population density is 1,239 per sq mi which is 2169% higher than the Iowa average and 1268% higher than the national average. The median age in Coggon is 31 which is approximately 19% lower than the Iowa average of 38. In Coggon, 61% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 89% of Coggon residents were born in Iowa, 11% were born out of state, 0% were born outside of the United States and 1% were foreign born.