Population 106 · Census ACS 2020–24
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Population and households in St. Mary
Household size in St. Mary
| Period | St. Mary | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 2.21 | 2.69 | 2.68 |
| 2010–14 | 2.27 | 2.71 | 2.73 |
| 2015–19 | 2.31 | 2.66 | 2.71 |
| 2020–24 | 2.69 | 2.58 | 2.65 |
| Change | +0.48 | −0.11 | −0.03 |
Households in St. Mary average 2.69 people, about the same as the country as a whole (2.65). The typical household here is bigger than in Illinois overall, where it has 2.58 people. Since 2006–10, household size has climbed from 2.21, 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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 37.3 | 37.6 | 37.7 |
| 2010–14 | 37.9 | 38.5 | 38.6 |
| 2015–19 | 37.8 | 39.6 | 39.6 |
| 2020–24 | 43.9 | 40.2 | 40.1 |
| Change | +6.6 | +2.6 | +2.3 |
The median resident of St. Mary is 43.9 years old, older than the national median of 40.1.
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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 7.9% | 11.7% | 12.3% |
| 2010–14 | 4.1% | 11.7% | 12.3% |
| 2015–19 | 8.1% | 11.1% | 11.6% |
| 2020–24 | 4.6% | 11.3% | 11.6% |
| Change | −3.3 pts | −0.4 pts | −0.6 pts |
Single-parent households are relatively rare in St. Mary: 4.6% of 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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 4.1% | 30.8% | 33.3% |
| 2010–14 | 0.0% | 33.1% | 35.6% |
| 2015–19 | 26.7% | 33.9% | 36.0% |
| 2020–24 | 6.6% | 32.9% | 34.8% |
| Change | +2.5 pts | +2.1 pts | +1.5 pts |
St. Mary is overwhelmingly a place of homeowners: only 6.6% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. About four in ten owners (39.6%) have paid off their mortgages, about the same as nationally.
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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 20.7% | 10.0% | 11.4% |
| 2010–14 | 13.4% | 10.1% | 11.4% |
| 2015–19 | 4.2% | 9.8% | 11.1% |
| 2020–24 | 4.7% | 8.1% | 9.6% |
| Change | −15.9 pts | −1.9 pts | −1.8 pts |
Only 4.7% of homes in St. Mary are vacant, far below the national rate of 9.6%, which usually means strong demand for housing.
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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 1972 | 1966 | 1974 |
| 2010–14 | 1971 | 1967 | 1975 |
| 2015–19 | 1985 | 1968 | 1977 |
| 2020–24 | 1978 | 1970 | 1980 |
| Change | +6 | +4 | +6 |
The typical home in St. Mary was built around 1978, about the same vintage as the country's housing overall (1980). Homes here are newer than in Illinois overall, where the median home dates to 1970.
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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | $483 | $953 | $965 |
| 2010–14 | $614 | $1,028 | $1,040 |
| 2015–19 | $483 | $1,165 | $1,213 |
| 2020–24 | $768 | $1,428 | $1,571 |
| Change | +$285 | +$475 | +$606 |
A typical rental in St. Mary costs $768 a month with utilities, well below the national median of $1,571. Rent takes 24.0% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent.
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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 3.1% | 31.2% | 28.4% |
| 2010–14 | 3.0% | 32.4% | 29.6% |
| 2015–19 | 1.8% | 34.7% | 32.1% |
| 2020–24 | 3.8% | 37.7% | 35.6% |
| Change | +0.7 pts | +6.5 pts | +7.2 pts |
College degrees are relatively uncommon in St. Mary: 3.8% 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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 48.3% | 86.3% | 84.9% |
| 2010–14 | 50.5% | 87.5% | 86.1% |
| 2015–19 | 46.5% | 89.1% | 87.7% |
| 2020–24 | 58.8% | 90.3% | 89.3% |
| Change | +10.5 pts | +4.0 pts | +4.3 pts |
About four in ten adults in St. Mary never finished high school, well above the national share: only 58.8% have a diploma or equivalent, against 89.3% nationally.
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 | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 6.7% | 8.7% | 8.1% |
| 2010–14 | 3.3% | 10.2% | 9.4% |
| 2015–19 | 9.8% | 6.1% | 5.6% |
| 2020–24 | 0.0% | 6.0% | 5.4% |
| Change | −6.7 pts | −2.7 pts | −2.7 pts |
The survey found almost no one in St. Mary out of work and looking, against 5.4% of the labor force nationally. 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 | 2.69 | 43.9 | 4.6% | 6.6% | 4.7% | 1978 | $768 | 3.8% | 58.8% | 0.0% |
| Reily Lake | 2.70 | 38.6 | 9.2% | 11.2% | 15.7% | 1977 | $833 | 11.1% | 85.0% | 6.2% |
| Chester | 2.40 | 42.6 | 7.2% | 20.2% | 10.8% | 1965 | $786 | 14.5% | 82.2% | 3.2% |
| Menard | 2.54 | 42.6 | 11.4% | 9.2% | 20.5% | 1976 | $855 | 14.6% | 94.1% | 9.9% |
| Ellis Grove | 2.55 | 42.2 | 11.4% | 9.3% | 20.5% | 1976 | $855 | 14.6% | 94.3% | 9.8% |
| Lithium | 2.84 | 38.7 | 5.1% | 9.7% | 11.2% | 1973 | $850 | 36.7% | 90.7% | 6.7% |
| Welge | 2.65 | 48.2 | 9.0% | 1.5% | 11.1% | 1981 | $828 | 16.1% | 85.7% | 1.4% |
| St. Mary | 2.70 | 46.1 | 8.6% | 18.9% | 22.0% | 1979 | $935 | 18.2% | 88.8% | 8.2% |
| Ozora | 2.69 | 46.4 | 9.7% | 20.0% | 22.8% | 1978 | $921 | 16.3% | 91.7% | 9.9% |
| Walsh | 2.19 | 56.8 | 11.8% | 4.6% | 17.6% | 1973 | $863 | 15.3% | 90.5% | 10.3% |
| Modoc | 2.34 | 42.5 | 17.2% | 11.9% | 15.0% | 1980 | $1,052 | 15.3% | 88.5% | 2.5% |
All figures 2020–24.
Cities with similar populations: Scenic, SD · Mesa, AR · Mexia Crossing, AL · Mill Creek, CA · Millhurst, IL · Absaraka, ND · Mills Mills, NY · Milner, KY · Milo, IL · Mineral Springs, FL
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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