In 2023, Belt, MT had a population of 525 people with a median age of 48.3 and a median household income of $72,083. Between 2022 and 2023 the population of Belt, MT declined from 532 to 525, a −1.32% decrease and its median household income grew from $65,500 to $72,083, a 10.1% increase.
The 5 largest ethnic groups in Belt, MT are White (Non-Hispanic) (89%), Other (Hispanic) (7.43%), Two+ (Non-Hispanic) (1.33%), Two+ (Hispanic) (1.14%), and Black or African American (Non-Hispanic) (0.762%).
None of the households in Belt, 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.
98.7% of the residents in Belt, MT are U.S. citizens.