Sioux City is a city located in Woodbury County Iowa. It is also the county seat of Woodbury County. With a 2020 population of 83,193, it is the 4th largest city in Iowa (after Des Moines, , and ) and the 421st largest city in the United States . Sioux City is currently growing at a rate of 0.33% annually and its population has increased by 0.62% since the most recent census, which recorded a population of 82,684 in 2010. Sioux City reached it's highest population of in . Spanning over 60 miles, Sioux City has a population density of 1,423 people per square mile.
The average household income in Sioux City is $69,899 with a poverty rate of 14.25%. The median rental costs in recent years comes to $783 per month, and the median house value is $116,600. The median age in Sioux City is 34.4 years, 33.4 years for males, and 35.6 years for females.