St. Mary Parish's estimated 2025 population is 45,527 with a growth rate of -1.65% in the past year according to the most recent United States census data. St. Mary Parish is the 23rd largest county in Louisiana. The 2010 population was 54,553 and has seen a growth of -16.55% since that time.
Data after 2023 is projected based on recent change
The racial composition of St. Mary Parish includes 56.11% White, 29.07% Black or African American, 3.8% other race, and smaller percentages for Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
White
Black or African American
Two or more races
Other race
Native American
Asian
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 27,189 | 56.11% |
| Black or African American | 14,084 | 29.07% |
| Two or more races | 3,909 | 8.07% |
| Other race | 1,841 | 3.8% |
| Native American | 788 | 1.63% |
| Asian | 633 | 1.31% |
| Native Hawaiian or Pacific Islander | 11 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
St. Mary Parish's average per capita income is $41,295. Household income levels show a median of $51,768. The poverty rate stands at 22.07%.
Name | Median | Mean |
|---|---|---|
| Married Families | $93,445 | - |
| Families | $65,357 | $83,462 |
| Households | $51,768 | $70,302 |
| Non Families | $28,267 | $41,094 |
Average Income
Median Household Income
Poverty Rate