Bonaparte, IA has a population of 441 and is the 20,334th largest city in the United States. The population density is 1,207 per sq mi which is 2110% higher than the Iowa average and 1233% higher than the national average. The median age in Bonaparte is 33 which is approximately 14% lower than the Iowa average of 38. In Bonaparte, 57% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 82% of Bonaparte residents were born in Iowa, 16% were born out of state, 0% were born outside of the United States and 1% were foreign born.