Columbus Junction is a city in Louisa County, Iowa, United States. The population was 1,899 at the 2010 census. It is part of the Muscatine Micropolitan Statistical Area.
Columbus Junction is home of the historic 'Swinging Bridge' found one block south of Highway 92 near downtown. Columbus Community School District serving Columbus Junction, Columbus City, Fredonia, Cotter, Conesville the surrounding townships is located in Columbus Junction. The city's largest employer is a Tyson pork processing plant located just north of the city on Highway 70.