Otho, IA has a population of 493 and is the 19,629th largest city in the United States. The population density is 1,077 per sq mi which is 1871% higher than the Iowa average and 1088% higher than the national average. The median age in Otho is 45 which is approximately 19% higher than the Iowa average of 38. In Otho, 58% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 84% of Otho residents were born in Iowa, 16% were born out of state, 0% were born outside of the United States and 0% were foreign born.