Arapahoe County is Colorado’s first county and the state’s third largest county with a population of 651,215. The County has grown by more than 75,000 people since the 2010 Census. Demographic information is a great way for residents and visitors to learn more about Arapahoe County. The following data was collected from 2018 Census Bureau reports. 

  • Population is 651,215. Only Denver and El Paso Counties are larger.
  • 242,141 householdsSince 2010, the population of persons 65 and over living alone in Arapahoe County has grown by 29 percent.
  • 36.9 years is the median age in the County. This is an increase of 1.2 years since 2010 
  • $76,768 is the median household income - $5,000 higher than that state-wide median income. 
  • 92.3 percent of Arapahoe County residents are high school graduates or higher. 
  • 42 percent have a bachelor's degree or higher - a 5 percent increase since 2010.
  • 40.7 percent Bachelor's Degree or higher, percent of persons age 25+.
  • 254,250 housing units in the County, of which 63 percent are owner occupied.  

Learn more about the characteristics that distinguish Arapahoe County. Get more in-depth information about the County, the district you live in and more. 

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