The total population of Oneida is estimated to be 295 with 105 males (35.59%) and 190 females (64.41%). There are 85 more females than males in Oneida.
In 2022, the population of Oneida was 59, a 1.67% decrease year-by-year from 2021. Previously, in 2021, Oneida's population was 60, a decline of 0.00% compared to a population of 60 in 2020.
The median age in Oneida, KS is 20.6, as per 2021 ACS 5-Year Estimates. Of the total population, 28.22% were under the age of 15, 52.28% aged 15 to 29, 17.43% aged 30 to 64, 1.66% aged 65 to 84, and 0.41% were 85 years of age and older.