Sergeant Bluff is a city in Woodbury County, Iowa, United States. It is part of the Sioux City, IowaSouth Dakota Metropolitan Statistical Area. The population was 3,321 at the 2000 census. A 2006 population count found 3,921 residents, making it the second-largest suburb of Sioux City. Sergeant Bluff apartments for rent comparison page shows most up to date rent information on Sergeant Bluff apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.