Lone Rock, IA has a population of 199 and is the 24,453rd largest city in the United States. The population density is 1,685 per sq mi which is 2984% higher than the Iowa average and 1759% higher than the national average. The median age in Lone Rock is 37 which is approximately 2% lower than the Iowa average of 38. In Lone Rock, 59% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 65% of Lone Rock residents were born in Iowa, 34% were born out of state, 1% were born outside of the United States and 1% were foreign born.