As of the 2020 census, Jefferson County had a population of 226,739. The ethnic and racial makeup of the county was 90.4% white (89.7% non-Hispanic white), 1.0% black or African American, 0.3% American Indian, 0.8% Asian, 0.8% some other race, and 6.6% two or more races. 2.4% of the population was of Hispanic or Latino origin.
As of the 2020 census Jefferson County had a population of 226739 The ethnic and racial makeup of the county was 904% white (897% non-Hispanic white) 10% black or African American 03% American Indian 08% Asian 08% some other race and 66% two or more races 24% of the population was of Hispanic or Latino origin