Population 86 · Census ACS 2020–24
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Population and households in St. Mary
Household size in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 2.64 | 2.41 | 2.68 |
| 2010–14 | 2.43 | 2.45 | 2.73 |
| 2015–19 | 3.94 | 2.44 | 2.71 |
| 2020–24 | 3.74 | 2.44 | 2.65 |
| Change | +1.10 | +0.03 | −0.03 |
St. Mary is a place of big households: 3.74 people per home on average, compared with 2.65 nationally. Numbers like that usually point to plenty of families with kids. Household size has climbed from 2.64 in 2006–10, but in a place this small, much of that may be survey noise rather than real change.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 35.1 | 39.9 | 37.7 |
| 2010–14 | 34.0 | 40.8 | 38.6 |
| 2015–19 | 33.5 | 41.5 | 39.6 |
| 2020–24 | 27.9 | 41.5 | 40.1 |
| Change | −7.2 | +1.6 | +2.3 |
With a median age of just 27.9, St. Mary is far younger than the country as a whole (40.1), a population that tilts toward families with many children.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 15.3% | 9.4% | 12.3% |
| 2010–14 | 10.6% | 9.8% | 12.3% |
| 2015–19 | 14.5% | 8.7% | 11.6% |
| 2020–24 | 19.4% | 8.8% | 11.6% |
| Change | +4.1 pts | −0.6 pts | −0.6 pts |
Single-parent households are common in St. Mary: 19.4% of all households, against 11.6% nationally.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in St. Mary
Renters in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 33.7% | 31.0% | 33.3% |
| 2010–14 | 33.3% | 32.3% | 35.6% |
| 2015–19 | 19.6% | 31.9% | 36.0% |
| 2020–24 | 24.1% | 30.8% | 34.8% |
| Change | −9.7 pts | −0.1 pts | +1.5 pts |
Only 24.1% of households in St. Mary rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 88.3% have no mortgage at all, well above the national share of 39.8%.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 58.3% | 13.2% | 11.4% |
| 2010–14 | 50.1% | 13.9% | 11.4% |
| 2015–19 | 56.8% | 14.1% | 11.1% |
| 2020–24 | 27.3% | 12.2% | 9.6% |
| Change | −31.0 pts | −0.9 pts | −1.8 pts |
Vacant homes make up 27.3% of the housing in St. Mary, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 1979 | 1974 | 1974 |
| 2010–14 | 1978 | 1977 | 1975 |
| 2015–19 | 1977 | 1978 | 1977 |
| 2020–24 | 1985 | 1982 | 1980 |
| Change | +6 | +7 | +6 |
The housing in St. Mary is a little younger than the country's: half of it was built after 1985, against 1980 nationally. That is in line with the rest of Montana.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | $525 | $703 | $965 |
| 2010–14 | $342 | $775 | $1,040 |
| 2015–19 | $635 | $870 | $1,213 |
| 2020–24 | $980 | $1,189 | $1,571 |
| Change | +$455 | +$487 | +$606 |
Rent in St. Mary runs $980 a month at the median, utilities included, well below the U.S. median of $1,571. Rent takes 33.6% of the typical renter's income, well over the 30% mark often used to define affordable rent, so many renters here are stretched.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in St. Mary
Bachelor's degrees in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 15.1% | 28.7% | 28.4% |
| 2010–14 | 22.3% | 29.8% | 29.6% |
| 2015–19 | 22.1% | 32.2% | 32.1% |
| 2020–24 | 20.6% | 35.3% | 35.6% |
| Change | +5.5 pts | +6.6 pts | +7.2 pts |
College degrees are relatively uncommon in St. Mary: 20.6% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 67.0% | 91.2% | 84.9% |
| 2010–14 | 90.0% | 92.6% | 86.1% |
| 2015–19 | 86.8% | 93.6% | 87.7% |
| 2020–24 | 95.4% | 94.6% | 89.3% |
| Change | +28.4 pts | +3.4 pts | +4.3 pts |
High school completion is high in St. Mary: 95.4% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. Montana as a whole looks much the same.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in St. Mary
| Period | St. Mary | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 12.2% | 5.7% | 8.1% |
| 2010–14 | 7.5% | 6.9% | 9.4% |
| 2015–19 | 4.2% | 4.2% | 5.6% |
| 2020–24 | 12.8% | 3.7% | 5.4% |
| Change | +0.6 pts | −2.0 pts | −2.7 pts |
Unemployment in St. Mary runs well above the national rate: 12.8% of the labor force was out of work and looking, against 5.4%. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
St. Mary compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| St. Mary | 3.74 | 27.9 | 19.4% | 24.1% | 27.3% | 1985 | $980 | 20.6% | 95.4% | 12.8% |
| Starr School | 3.33 | 38.0 | 25.4% | 9.1% | 29.1% | 1992 | $832 | 18.5% | 75.2% | 7.4% |
| Swiftcurrent | 3.58 | 26.8 | 28.5% | 25.6% | 52.2% | 1983 | $761 | 21.0% | 96.4% | 15.0% |
| Babb | 4.03 | 25.3 | 25.3% | 24.3% | 41.7% | 1988 | $880 | 21.9% | 96.0% | 16.8% |
| Browning | 3.19 | 30.6 | 30.9% | 48.7% | 13.2% | 1979 | $520 | 14.5% | 83.7% | 14.9% |
| East Glacier Park | 2.70 | 39.6 | 19.3% | 13.8% | 23.0% | 1983 | $875 | 33.0% | 88.1% | 6.2% |
| Del Bonita | 3.26 | 32.2 | 9.5% | 23.2% | 3.5% | 1980 | $1,145 | 18.5% | 94.4% | 6.1% |
| Heart Butte | 3.25 | 34.8 | 29.7% | 37.7% | 18.1% | 1985 | $535 | 18.4% | 87.9% | 11.4% |
| Summit | 2.37 | 47.3 | 10.6% | 13.3% | 42.3% | 1984 | $1,101 | 31.7% | 92.2% | 3.0% |
| Essex | 2.38 | 48.9 | 8.9% | 13.7% | 47.5% | 1986 | $1,127 | 29.9% | 91.6% | 2.2% |
| Cut Bank | 2.91 | 40.0 | 18.1% | 29.5% | 19.6% | 1955 | $947 | 18.1% | 88.9% | 4.0% |
All figures 2020–24.
Cities with similar populations: Seitz, KY · Minerva, OR · Mynot, AL · Sayre, AR · Schaal, AR · Schluersburg, MO · Scholls, OR · Schuchk, AZ · Scotch Bonnet, NJ · Scotland Beach, MD
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up St. Mary. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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