Bagley, IA has a population of 335 and is the 21,867th largest city in the United States. The population density is 1,083 per sq mi which is 1883% higher than the Iowa average and 1096% higher than the national average. The median age in Bagley is 44 which is approximately 15% higher than the Iowa average of 38. In Bagley, 59% of the population over 15 years of age are married, 94% speak English and 6% speak Spanish. 81% of Bagley residents were born in Iowa, 16% were born out of state, 0% were born outside of the United States and 3% were foreign born.