Columbus Junction, IA has a population of 2,214 and is the 10,458th largest city in the United States. The population density is 1,012 per sq mi which is 1752% higher than the Iowa average and 1017% higher than the national average. The median age in Columbus Junction is 36 which is approximately 7% lower than the Iowa average of 38. In Columbus Junction, 63% of the population over 15 years of age are married, 47% speak English and 38% speak Spanish. 51% of Columbus Junction residents were born in Iowa, 21% were born out of state, 0% were born outside of the United States and 28% were foreign born.