2020 census thumb|left|2022 US Census population pyramid for Carroll County from ACS 5-year estimates The 2020 census recorded a population of 20,760 in the county, with a population density of . 97.14% of the population reported being of one race. 91.28% were non-Hispanic White, 1.26% were Black, 2.86% were Hispanic, 0.15% were Native American, 0.36% were Asian, 0.00% were Native Hawaiian or Pacific Islander and 4.08% were some other race or more than one race. There were 9,490 housing units of which 8,764 were occupied.
2020 census thumb|left|2022 US Census population pyramid for Carroll County from ACS 5-year estimates The 2020 census recorded a population of 20,760 in the county, with a population density of . 97.14% of the population reported being of one race. 91.28% were non-Hispanic White, 1.26% were Black, 2.86% were Hispanic, 0.15% were Native American, 0.36% were Asian, 0.00% were Native Hawaiian or Pacific Islander and 4.08% were some other race or more than one race. There were 9,490 housing units of which 8,764 were occupied.