In 2022, the population of Udell was 31, a 3.12% decrease year-by-year from 2021. Previously, in 2021, Udell's population was 32, a decline of 0.00% compared to a population of 32 in 2020.
The median age in Udell, IA is 40.6, as per 2021 ACS 5-Year Estimates. Of the total population, 26.67% were under the age of 15, 6.67% aged 15 to 29, 56.67% aged 30 to 64, 3.33% aged 65 to 84, and 6.67% were 85 years of age and older.