Rockwell City, IA has a population of 2,212 and is the 10,460th largest city in the United States. The population density is 524 per sq mi which is 858% higher than the Iowa average and 478% higher than the national average. The median age in Rockwell City is 45 which is approximately 19% higher than the Iowa average of 38. In Rockwell City, 50% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 73% of Rockwell City residents were born in Iowa, 25% were born out of state, 1% were born outside of the United States and 1% were foreign born.