In 2023, Sweet Grass, MT had a population of 64 people with a median age of 54.5 and a median household income of $79,886. Between 2022 and 2023 the population of Sweet Grass, MT declined from 70 to 64, a −8.57% decrease and its median household income grew from $75,263 to $79,886, a 6.14% increase.
The 5 largest ethnic groups in Sweet Grass, MT are White (Non-Hispanic) (78.1%), Other (Hispanic) (21.9%), Black or African American (Non-Hispanic) (0%), American Indian & Alaska Native (Non-Hispanic) (0%), and Asian (Non-Hispanic) (0%).
None of the households in Sweet Grass, 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.
78.1% of the residents in Sweet Grass, MT are U.S. citizens.
Most people in Sweet Grass, MT drove alone to work, and the average commute time was 5.57 minutes. The average car ownership in Sweet Grass, MT was 2 cars per household.