Sioux Center is a city in Sioux County, Iowa, United States. Sioux Center is 1,445 feet (440 m) above sea level. It is located on the north to south ridge, or spine, of western Iowa. The eastern side of Sioux Center drains to the Floyd River. The western side of Sioux Center drains to the Big Sioux River. This "divide" is profoundly unnoticeable.