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All Jefferson County population data above are from the US Census Bureau.
The population data for Jefferson County are from the Census 2000, Census 2010, the Census' American Community Survey 2016 5-year estimates and the Census' 2016 Population Estimates. The demographic data for Adams County, Larimer County, Pitkin County, and Summit County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2016 5-year estimates, and were downloaded on December 2017. Check out our FAQ section for more details.
With 571,837 people, Jefferson County is the 4th most populated county in the state of Colorado out of 64 counties. But watch out, Jefferson County, because Adams County with 498,187 people and Larimer County with 339,993 people are right behind you.
The largest Jefferson County racial/ethnic groups are White (78.9%) followed by Hispanic (15.0%) and Asian (2.6%).
In 2016, the median household income of Jefferson County residents was $72,017. Jefferson County households made slightly more than Pitkin County households ($69,789) and Summit County households ($70,192) . However, 8.1% of Jefferson County residents live in poverty.
The median age for Jefferson County residents is 40.5 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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