In 2023, Big Arm, MT had a population of 142 people with a median age of 31.5 and a median household income of $N/A. Between 2022 and 2023 the population of Big Arm, MT declined from 168 to 142, a −15.5% decrease and its median household income stayed from $N/A to $N/A, a NaNN% change.
The 5 largest ethnic groups in Big Arm, MT are American Indian & Alaska Native (Non-Hispanic) (60.6%), White (Non-Hispanic) (39.4%), Black or African American (Non-Hispanic) (0%), Asian (Non-Hispanic) (0%), and Native Hawaiian & Other Pacific Islander (Non-Hispanic) (0%).
None of the households in Big Arm, MT 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 Big Arm, MT are U.S. citizens.