In 2022, the population of Oriska was 110, a 0.90% decrease year-by-year from 2021. Previously, in 2021, Oriska's population was 111, a decline of 0.89% compared to a population of 112 in 2020.
The median age in Oriska, ND is 31.0, as per 2021 ACS 5-Year Estimates. Of the total population, 33.17% were under the age of 15, 10.73% aged 15 to 29, 44.39% aged 30 to 64, 10.73% aged 65 to 84, and 0.98% were 85 years of age and older.