Randolph, IA has a population of 190 and is the 24,692nd largest city in the United States. The population density is 598 per sq mi which is 995% higher than the Iowa average and 560% higher than the national average. The median age in Randolph is 37 which is approximately 3% lower than the Iowa average of 38. In Randolph, 62% of the population over 15 years of age are married, 92% speak English and 1% speak Spanish. 49% of Randolph residents were born in Iowa, 45% were born out of state, 0% were born outside of the United States and 6% were foreign born.