Columbus City, IA has a population of 447 and is the 20,251st largest city in the United States. The population density is 1,872 per sq mi which is 3326% higher than the Iowa average and 1966% higher than the national average. The median age in Columbus City is 38 which is approximately equal to the Iowa average of 38. In Columbus City, 64% of the population over 15 years of age are married, 49% speak English and 49% speak Spanish. 56% of Columbus City residents were born in Iowa, 16% were born out of state, 3% were born outside of the United States and 26% were foreign born.