In 2023, Allen, SD had a population of 860 people with a median age of 20.2 and a median household income of N/A. Between 2022 and 2023 the population of Allen, SD declined from 926 to 860, a −7.13% decrease and its median household income N/A from N/A to N/A, a N/A% N/A.
The 5 largest ethnic groups in Allen, SD are American Indian & Alaska Native (Non-Hispanic) (92.8%), American Indian & Alaska Native (Hispanic) (7.21%), 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 9.07 minutes. The average car ownership in Allen, SD was 1 car per household.