Glenwood, IA has a population of 5,233 and is the 6,256th largest city in the United States. The population density is 1,775 per sq mi which is 3149% higher than the Iowa average and 1859% higher than the national average. The median age in Glenwood is 43 which is approximately 12% higher than the Iowa average of 38. In Glenwood, 56% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 54% of Glenwood residents were born in Iowa, 45% were born out of state, 1% were born outside of the United States and 0% were foreign born.