Montezuma, IA has a population of 1,591 and is the 12,363rd largest city in the United States. The population density is 641 per sq mi which is 1074% higher than the Iowa average and 608% higher than the national average. The median age in Montezuma is 34 which is approximately 11% lower than the Iowa average of 38. In Montezuma, 69% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 88% of Montezuma residents were born in Iowa, 12% were born out of state, 0% were born outside of the United States and 0% were foreign born.