In 1955 the city decided to consolidate the neighboring incorporated city of South Sioux Falls. At the time South Sioux Falls had a population of nearly 1,600 inhabitants, according to the 1950 census. It was the third largest city in the county after Sioux Falls and Dell Rapids. By October 18, 1955, South Sioux Falls residents voted 704 in favor and 227 against to consolidate with Sioux Falls. On the same issue, Sioux Falls residents voted on November 15 by the vote 2,714 in favor and 450 against.