In 2022, the population of Olmitz was 89, a 1.11% decrease year-by-year from 2021. Previously, in 2021, Olmitz's population was 90, a decline of 1.10% compared to a population of 91 in 2020.
The median age in Olmitz, KS is 57.8, as per 2021 ACS 5-Year Estimates. Of the total population, 10.34% were under the age of 15, 5.17% aged 15 to 29, 53.45% aged 30 to 64, 13.79% aged 65 to 84, and 17.24% were 85 years of age and older.