In 2022, the population of Bena was 149, a 0.68% increase year-by-year from 2021. Previously, in 2021, Bena's population was 148, an increase of 2.78% compared to a population of 144 in 2020.
The median age in Bena, MN is 29.3, as per 2021 ACS 5-Year Estimates. Of the total population, 34.13% were under the age of 15, 17.46% aged 15 to 29, 37.30% aged 30 to 64, 11.11% aged 65 to 84, and 0.00% were 85 years of age and older.