St. Mary Flag

St. Mary

County:
Glacier County
County Seat:
No
Area (mi²):
0.753
State:
Montana

St. Mary is a CDP located in Glacier County, Montana. St. Mary has a 2025 population of 303 . St. Mary is currently growing at a rate of 7.45% annually but its population has decreased by -47.67% since the most recent census, which recorded a population of 579 in 2020.

The median age in St. Mary is 22 years: 21.6 years for males, and 24.6 years for females. For every 100 females there are 143.0 males.

303
Total Population
403
Density (mi²)
21 7.45%
Growth

St. Mary Population

St. Mary Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of St. Mary includes 77.51% White, 8.13% Native American, 7.18% Native Hawaiian or Pacific Islander, 7.18% other race, and smaller percentages for and multiracial populations.

Population by Race

White (77.51%)

Native American (8.13%)

Native Hawaiian or Pacific Islander (7.18%)

Other race (7.18%)

Race
Population
Percentage (of total)
White16277.51%
Native American178.13%
Native Hawaiian or Pacific Islander157.18%
Other race157.18%

St. Mary Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)