Columbus Junction is a city in Louisa County, Iowa. The population was 1,830 at the 2020 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. The 262-foot-long steel cable and wood suspension bridge was built in 1922 as an elevated walkway connecting Third and Fourth streets. The Columbus Community School District is based in Columbus Junction.