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All Sioux County population data above are from the US Census Bureau.
The population data for Sioux County are from the Census' American Community Survey 2017 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Bremer County, Grundy County, Lee County, and Marion County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2017 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 34,909 people, Sioux County is the 20th most populated county in the state of Iowa out of 99 counties. But watch out, Sioux County, because Lee County with 34,055 people and Marion County with 33,407 people are right behind you.
The largest Sioux County racial/ethnic groups are White (87.5%) followed by Hispanic (10.2%) and Two or More (1.0%).
In 2017, the median household income of Sioux County residents was $66,022. Sioux County households made slightly more than Bremer County households ($65,440) and Grundy County households ($65,170) . However, 7.9% of Sioux County residents live in poverty.
The median age for Sioux County residents is 33.3 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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