St. Mary, MT Demographics

A map of St. Mary's Population by Race

St. Mary, Montana has an estimated population of 193, a dramatic increase from the 54 recorded in the 2020 Census. The population is 53.4% White, 23.8% Hispanic, 22.8% Native American/Other, 0.0% Black, 0.0% Asian, and 0.0% Multiracial. This demographic dot map shows the population of St. Mary, with one dot drawn for each person counted by the Census, color-coded by race.

St. Mary has become less racially diverse since the 2020 Census. It is considerably more diverse than Montana overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In St. Mary, that probability was 62.5% in 2020 and 60.6% in the most recent ACS estimates.

St. Mary is ranked the 253rd most populous place in Montana, out of 497 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). St. Mary was ranked the 389th most populous place in the 2020 Census.

St. Mary's White Population

103 residents of St. Mary, or 53.4% of the population, identify as White. The share of White residents in St. Mary is significantly lower than in Montana overall, where 83.6% of the population is White. St. Mary ranks 436th statewide in terms of White residents as a share of the population, out of 497 places.

Since the 2020 Census, St. Mary's White population has grown by an estimated 243.3%. White residents' share of St. Mary's population has decreased from 55.6% to 53.4%.

St. Mary is more White than neighboring Babb (2.2% White), Starr School (0% White), East Glacier Park Village (46.9% White), and North Browning (1.5% White). St. Mary is less White than neighboring Pinnacle (91.7% White).

St. Mary's Black Population

0 residents of St. Mary, or 0.0% of the population, identify as Black. The share of Black residents in St. Mary is comparable to the share in Montana overall, where 0.4% of the population is Black. St. Mary ranks 179th statewide in terms of Black residents as a share of the population, out of 497 places.

Since the 2020 Census, St. Mary's Black population has grown from 0 to an estimated 0. Black residents' share of St. Mary's population has remained roughly unchanged at 0.0%.

St. Mary is less Black than neighboring North Browning (0.9% Black).

St. Mary's Asian Population

0 residents of St. Mary, or 0.0% of the population, identify as Asian. The share of Asian residents in St. Mary is comparable to the share in Montana overall, where 0.8% of the population is Asian. St. Mary ranks 2nd statewide in terms of Asian residents as a share of the population, out of 497 places.

Since the 2020 Census, St. Mary's Asian population has declined by an estimated 100.0%. Asian residents' share of St. Mary's population has decreased from 5.6% to 0.0%.

St. Mary is less Asian than neighboring East Glacier Park Village (0.7% Asian), and North Browning (0.4% Asian).

St. Mary's Hispanic Population

46 residents of St. Mary, or 23.8% of the population, identify as Hispanic. The share of Hispanic residents in St. Mary is significantly higher than in Montana overall, where 4.6% of the population is Hispanic. St. Mary ranks 17th statewide in terms of Hispanic residents as a share of the population, out of 497 places.

Since the 2020 Census, St. Mary's Hispanic population has grown by an estimated 820.0%. Hispanic residents' share of St. Mary's population has increased from 9.3% to 23.8%.

St. Mary is more Hispanic than neighboring Babb (3.1% Hispanic), Starr School (0% Hispanic), East Glacier Park Village (0% Hispanic), North Browning (0.2% Hispanic), and Pinnacle (0% Hispanic).

St. Mary's Native American/Other Population

44 residents of St. Mary, or 22.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in St. Mary is significantly higher than in Montana overall, where 5.9% of the population is Native American/Other. St. Mary ranks 55th statewide in terms of Native American/Other residents as a share of the population, out of 497 places.

Since the 2020 Census, St. Mary's Native American/Other population has grown by an estimated 266.7%. Native American/Other residents' share of St. Mary's population has increased from 22.2% to 22.8%.

St. Mary is more Native American/Other than neighboring Pinnacle (0% Native American/Other). St. Mary is less Native American/Other than neighboring Babb (94.6% Native American/Other), Starr School (100% Native American/Other), East Glacier Park Village (49.4% Native American/Other), and North Browning (97% Native American/Other).

St. Mary's Multiracial Population

0 residents of St. Mary, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in St. Mary is slightly lower than in Montana overall, where 4.7% of the population is Multiracial. St. Mary ranks 81st statewide in terms of Multiracial residents as a share of the population, out of 497 places.

Since the 2020 Census, St. Mary's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of St. Mary's population has decreased from 7.4% to 0.0%.

St. Mary is less Multiracial than neighboring East Glacier Park Village (3% Multiracial), and Pinnacle (8.3% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.