Jefferson County, Colorado Demographics 2026

Population Overview

Jefferson County is located in Colorado with a total population of 579,715. It is the 4th most populous county out of 64 in Colorado.

Age Demographics

The median age in Jefferson County is 40.4 years. This is 8% higher than the state median of 37.5 years.

Economy, Income & Housing

The median household income in Jefferson County is $107,800. This is 17% higher than the state median of $92,470. Compared to the national median of $78,538, household income here is 37% higher. The poverty rate stands at 6.7%. This is 29% lower than the state poverty rate of 9.4%. The unemployment rate is 3.9%. This is 14% lower than the state rate of 4.5%. The median home value is $604,400. Housing costs are 20% higher than the state median of $502,200. The home-value-to-income ratio is 5.6x. 70.6% of occupied housing units are owner-occupied. This homeownership rate is 6% higher than the state average of 66.3%.

Race & Ethnicity

The largest racial or ethnic group in Jefferson County is White (non-Hispanic), making up 75.9% of the population. Hispanic or Latino residents account for 15.9%. The Black or African American population (1.1%) is well below the state average of 3.8%.

Education

50.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 13% higher than the state rate of 44.7%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.5%. Notably, 18.7% of adults hold a graduate or professional degree, indicating a highly educated workforce.