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All Arapahoe County population data above are from the US Census Bureau.
The population data for Arapahoe County are from the Census' American Community Survey 2018 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Adams County, Garfield County, Jefferson County, and Pitkin County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2018 5-year estimates, and were downloaded on 19 December 2019. Check out our FAQ section for more details.
With 636,671 people, Arapahoe County is the 3rd most populated county in the state of Colorado out of 64 counties. But watch out, Arapahoe County, because Adams County with 497,115 people and Jefferson County with 570,427 people are right behind you.
The largest Arapahoe County racial/ethnic groups are White (60.7%) followed by Hispanic (19.1%) and Black (10.3%).
In 2018, the median household income of Arapahoe County residents was $73,925. Arapahoe County households made slightly more than Garfield County households ($72,898) and Pitkin County households ($71,244) . However, 9.0% of Arapahoe County residents live in poverty.
The median age for Arapahoe County residents is 36.5 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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