In 2022, the population of Hartman was 53, a 1.85% decrease year-by-year from 2021. Previously, in 2021, Hartman's population was 54, a decline of 0.00% compared to a population of 54 in 2020.
The median age in Hartman, CO is 42.0, as per 2021 ACS 5-Year Estimates. Of the total population, 18.06% were under the age of 15, 20.83% aged 15 to 29, 54.17% aged 30 to 64, 2.78% aged 65 to 84, and 4.17% were 85 years of age and older.