In 2022, the population of Atka was 51, a 1.92% decrease year-by-year from 2021. Previously, in 2021, Atka's population was 52, a decline of 3.70% compared to a population of 54 in 2020.
The median age in Atka, AK is 21.3, as per 2021 ACS 5-Year Estimates. Of the total population, 47.37% were under the age of 15, 13.16% aged 15 to 29, 31.58% aged 30 to 64, 7.89% aged 65 to 84, and 0.00% were 85 years of age and older.