In 2022, the population of Harris was 61, a 1.61% decrease year-by-year from 2021. Previously, in 2021, Harris's population was 62, a decline of 1.59% compared to a population of 63 in 2020.
The median age in Harris, MO is 33.2, as per 2021 ACS 5-Year Estimates. Of the total population, 23.40% were under the age of 15, 19.15% aged 15 to 29, 44.68% aged 30 to 64, 2.13% aged 65 to 84, and 10.64% were 85 years of age and older.