Population 47,828 · Census ACS 2020–24
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Population and households in St. Mary Parish
Household size in St. Mary Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 2.71 | 2.66 | 2.68 |
| 2010–14 | 2.64 | 2.64 | 2.73 |
| 2015–19 | 2.53 | 2.64 | 2.71 |
| 2020–24 | 2.62 | 2.59 | 2.65 |
| Change | −0.10 | −0.07 | −0.03 |
Households in St. Mary Parish average 2.62 people, about the same as the country as a whole (2.65). Since 2006–10, household size has dropped from 2.71, a much bigger shift than nationally. Households are largest in the east and smallest in the center.
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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 37.2 | 36.8 | 37.7 |
| 2010–14 | 38.1 | 37.4 | 38.6 |
| 2015–19 | 39.6 | 38.3 | 39.6 |
| 2020–24 | 39.7 | 39.0 | 40.1 |
| Change | +2.6 | +2.2 | +2.3 |
At 39.7, the median age in St. Mary Parish is close to the national median of 40.1, so its age mix looks much like the country's. The median age has climbed from 37.2 in 2006–10, as it has nationally. Residents skew youngest in the southeast and oldest in the center.
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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 18.5% | 14.7% | 12.3% |
| 2010–14 | 17.6% | 15.1% | 12.3% |
| 2015–19 | 11.0% | 14.1% | 11.6% |
| 2020–24 | 17.4% | 15.2% | 11.6% |
| Change | −1.1 pts | +0.5 pts | −0.6 pts |
Single parents head just over one in six households in St. Mary Parish (17.4%), well above the national share of 11.6%. The single-parent share has edged down 1.1 points since 2006–10, mirroring the country.
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 Parish
Renters in St. Mary Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 29.9% | 31.8% | 33.3% |
| 2010–14 | 31.1% | 33.7% | 35.6% |
| 2015–19 | 39.3% | 34.4% | 36.0% |
| 2020–24 | 31.4% | 32.6% | 34.8% |
| Change | +1.5 pts | +0.9 pts | +1.5 pts |
Most households in St. Mary Parish own their homes; 31.4% rent, a little below the national share of 34.8%. Just over six in ten owners (62.6%) have paid off their mortgages, well above the national share of 39.8%. Rentals cluster in the southeast; owners are most common in the center. Since 2006–10, the renter share has risen 1.5 points, as it has 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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 12.2% | 13.9% | 11.4% |
| 2010–14 | 12.0% | 13.1% | 11.4% |
| 2015–19 | 14.4% | 15.1% | 11.1% |
| 2020–24 | 16.2% | 14.4% | 9.6% |
| Change | +4.0 pts | +0.5 pts | −1.8 pts |
Vacancy is high in St. Mary Parish: 16.2% of homes are empty, 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. Vacancy is up 4.0 points from 2006–10, even as the national rate fell.
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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 1973 | 1977 | 1974 |
| 2010–14 | 1974 | 1979 | 1975 |
| 2015–19 | 1976 | 1981 | 1977 |
| 2020–24 | 1977 | 1984 | 1980 |
| Change | +4 | +7 | +6 |
Homes in St. Mary Parish are about the same age as the nation's housing: the median home was built in 1977, versus 1980 nationally. Homes here are older than in Louisiana overall, where the median home dates to 1984. The median year built has moved up from 1973 in 2006–10, a sign of steady new building. The newest homes are mostly in the center, the oldest in the north.
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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | $575 | $755 | $965 |
| 2010–14 | $718 | $831 | $1,040 |
| 2015–19 | $788 | $920 | $1,213 |
| 2020–24 | $884 | $1,122 | $1,571 |
| Change | +$309 | +$366 | +$606 |
A typical rental in St. Mary Parish costs $884 a month with utilities, well below the national median of $1,571. Rents are up $309 a month from 2006–10, a 54% rise, a slower climb than the nation's. Rent takes 30.4% of the typical renter's income, just over 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 Parish
Bachelor's degrees in St. Mary Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 10.8% | 22.0% | 28.4% |
| 2010–14 | 11.3% | 22.8% | 29.6% |
| 2015–19 | 10.4% | 24.5% | 32.1% |
| 2020–24 | 13.7% | 27.5% | 35.6% |
| Change | +2.9 pts | +5.5 pts | +7.2 pts |
College degrees are relatively uncommon in St. Mary Parish: 13.7% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%. Since 2006–10, the share with a degree has risen 2.9 points, mirroring the country. St. Mary Parish has a lower share of college graduates than the great majority of Louisiana counties.
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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 70.2% | 81.7% | 84.9% |
| 2010–14 | 74.1% | 83.3% | 86.1% |
| 2015–19 | 82.8% | 85.4% | 87.7% |
| 2020–24 | 79.7% | 87.2% | 89.3% |
| Change | +9.5 pts | +5.5 pts | +4.3 pts |
About one in five adults in St. Mary Parish never finished high school, well above the national share: only 79.7% have a diploma or equivalent, against 89.3% nationally. The share with a diploma is up 9.5 points from 2006–10, mirroring the country. St. Mary Parish has a lower share of high school graduates than the great majority of Louisiana counties.
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 Parish
| Period | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| 2006–10 | 6.8% | 7.9% | 8.1% |
| 2010–14 | 11.6% | 8.7% | 9.4% |
| 2015–19 | 8.5% | 6.7% | 5.6% |
| 2020–24 | 4.9% | 6.5% | 5.4% |
| Change | −1.9 pts | −1.4 pts | −2.7 pts |
Unemployment in St. Mary Parish is close to the national rate: 4.9% of the labor force, against 5.4%. The rate is lower than in Louisiana as a whole (6.5%). Unemployment is down 1.9 points from 2006–10, as it has nationally.
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 Parish compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| St. Mary Parish | 2.62 | 39.7 | 17.4% | 31.4% | 16.2% | 1977 | $884 | 13.7% | 79.7% | 4.9% |
| Assumption Parish | 2.29 | 43.5 | 11.8% | 15.2% | 11.6% | 1984 | $816 | 13.8% | 79.8% | 5.8% |
| Iberia Parish | 2.87 | 39.8 | 20.6% | 32.7% | 17.3% | 1982 | $996 | 17.6% | 82.3% | 7.6% |
| Iberville Parish | 2.44 | 40.3 | 18.9% | 24.9% | 16.4% | 1988 | $877 | 18.5% | 83.9% | 6.7% |
| Terrebonne Parish | 2.55 | 39.8 | 15.4% | 24.7% | 11.2% | 1983 | $1,005 | 19.1% | 83.7% | 4.7% |
| St. James Parish | 2.56 | 42.7 | 13.0% | 15.6% | 13.5% | 1986 | $1,125 | 19.7% | 87.7% | 4.0% |
| Lafourche Parish | 2.55 | 39.9 | 14.8% | 20.1% | 9.3% | 1985 | $981 | 22.5% | 84.0% | 3.7% |
| Ascension Parish | 2.78 | 37.8 | 14.0% | 19.0% | 8.6% | 2000 | $1,371 | 28.7% | 89.1% | 4.5% |
| St. Martin Parish | 2.77 | 39.9 | 17.8% | 22.3% | 18.3% | 1988 | $861 | 18.9% | 83.5% | 3.8% |
| Vermilion Parish | 2.69 | 39.8 | 16.0% | 26.6% | 16.1% | 1985 | $868 | 18.5% | 83.7% | 4.9% |
| Lafayette Parish | 2.54 | 38.8 | 14.2% | 34.5% | 12.4% | 1991 | $1,092 | 36.8% | 90.0% | 4.6% |
All figures 2020–24.
Counties with similar populations: Cortland County, NY · Upshur County, TX · Val Verde County, TX · Vance County, NC · Vega Baja Municipio, PR · Venango County, PA · Waldo County, ME · Warren County, TN · Delaware County, OK · Darke County, OH
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 Parish. 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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