In 2022, the population of Glendo was 239, a 0.84% increase year-by-year from 2021. Previously, in 2021, Glendo's population was 237, an increase of 0.42% compared to a population of 236 in 2020.
The median age in Glendo, WY is 64.9, as per 2021 ACS 5-Year Estimates. Of the total population, 4.23% were under the age of 15, 14.81% aged 15 to 29, 31.22% aged 30 to 64, 44.44% aged 65 to 84, and 5.29% were 85 years of age and older.