In 2021, the population of Pioneer was 4, a 0.00% decrease year-by-year from 2020. Previously, in 2020, Pioneer's population was 4, a decline of 81.82% compared to a population of 22 in 2019.
The median age in Pioneer, IA is 72.3, as per 2021 ACS 5-Year Estimates. Of the total population, 0.00% were under the age of 15, 10.53% aged 15 to 29, 21.05% aged 30 to 64, 68.42% aged 65 to 84, and 0.00% were 85 years of age and older.