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 parish 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.
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