Forest City, IA has a population of 4,043 and is the 7,404th largest city in the United States. The population density is 873 per sq mi which is 1498% higher than the Iowa average and 864% higher than the national average. The median age in Forest City is 37 which is approximately 2% lower than the Iowa average of 38. In Forest City, 55% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 67% of Forest City residents were born in Iowa, 31% were born out of state, 0% were born outside of the United States and 2% were foreign born.