Rockford, IA has a population of 760 and is the 16,951st largest city in the United States. The population density is 1,204 per sq mi which is 2103% higher than the Iowa average and 1228% higher than the national average. The median age in Rockford is 43 which is approximately 12% higher than the Iowa average of 38. In Rockford, 62% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 84% of Rockford residents were born in Iowa, 14% were born out of state, 1% were born outside of the United States and 1% were foreign born.