In 2021, Allen, SD had a population of 732 people with a median age of 15.9 and a median household income of $11,705. Between 2020 and 2021 the population of Allen, SD grew from 477 to 732, a 53.5% increase and its median household income grew from $9,511 to $11,705, a 23.1% increase.
The 5 largest ethnic groups in Allen, SD are American Indian & Alaska Native (Non-Hispanic) (90.3%), American Indian & Alaska Native (Hispanic) (9.7%), White (Non-Hispanic) (0%), White (Hispanic) (0%), and Black or African American (Non-Hispanic) (0%).
None of the households in Allen, SD reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
100% of the residents in Allen, SD are U.S. citizens.
Most people in Allen, SD drove alone to work, and the average commute time was 26.8 minutes. The average car ownership in Allen, SD was 3 cars per household.