In 2022, the population of Seibert was 174, a 1.16% increase year-by-year from 2021. Previously, in 2021, Seibert's population was 172, a decline of 0.58% compared to a population of 173 in 2020.
The median age in Seibert, CO is 48.8, as per 2021 ACS 5-Year Estimates. Of the total population, 21.80% were under the age of 15, 7.52% aged 15 to 29, 42.86% aged 30 to 64, 22.56% aged 65 to 84, and 5.26% were 85 years of age and older.