St. Mary Parish, Louisiana

St. Mary Parish, Louisiana, had an estimated population of 46,552 in 2025 across 1,447 km². The figures below come from the US Census Bureau's population estimates and the American Community Survey, each shown with its own vintage and its rank among Louisiana's counties and nationally.

Population: 46,552; 2025 estimate
Area: 1,447 km²
Density: 32; per km²
Median income: $52,576; household, ACS 2024
Median age: 39.7; years, ACS 2024

How Louisiana's counties spread

Amenities & Infrastructure

Indicator	Value	In Louisiana	In the US
Households with Broadband2024	87.4%	19 / 64	1,452 / 3,144
Median Gross Rent2024	$848	32 / 64	1,758 / 3,137
Median Home Value2024	$138,900	42 / 64	2,385 / 3,139
Owner-Occupied Homes2024	68.6%	45 / 64	2,373 / 3,144
Vacant Homes2024	18.0%	27 / 64	1,025 / 3,144

Demography

Indicator	Value	In Louisiana	In the US
Aged 65 and Over2024	18.3%	26 / 64	2,074 / 3,144
American Indian & Alaska Native2024	1.5%	5 / 64	373 / 3,144
Asian, non-Hispanic2024	1.0%	19 / 64	1,011 / 3,144
Average Household Size2024people	2.6	19 / 64	831 / 3,144
Black, non-Hispanic2024	28.8%	31 / 64	303 / 3,144
Foreign-Born2024	5.0%	10 / 64	969 / 3,144
Hispanic or Latino2024	9.8%	3 / 64	901 / 3,144
Median Age2024years	39.7	29 / 64	2,109 / 3,144
Sex Ratio2024per 1,000 males	1,057	16 / 64	416 / 3,144
Speak a Language Other Than English2024	10.0%	8 / 64	919 / 3,144
Under 182024	24.5%	21 / 64	543 / 3,144
Veterans2024	5.1%	42 / 64	2,711 / 3,144
White, non-Hispanic2024	53.4%	46 / 64	2,636 / 3,144

Economy

Indicator	Value	In Louisiana	In the US
Below Poverty Line2024	20.8%	33 / 64	397 / 3,144
Households on SNAP2024	22.8%	23 / 64	244 / 3,144
Income Inequality2024index	0.473	37 / 64	683 / 3,144
Median Household Income2024	$52,576	35 / 64	2,626 / 3,143
Per Capita Income2024	$28,265	39 / 64	2,673 / 3,144
Unemployment Rate2024	5.4%	40 / 64	885 / 3,144

Education

Indicator	Value	In Louisiana	In the US
Bachelor's Degree or Higher2024	13.6%	53 / 64	2,894 / 3,144
High School or Higher2024	80.3%	57 / 64	2,951 / 3,144

Health Coverage

Indicator	Value	In Louisiana	In the US
No Health Insurance2024	8.5%	10 / 64	1,381 / 3,144
With a Disability2024	16.7%	41 / 64	1,354 / 3,144

Population & Density

Indicator	Value	In Louisiana	In the US
Population2025	46,552	23 / 64	1,062 / 3,144
Population Density2025/km²	32	24 / 64	1,038 / 3,144

Work & Commute

Indicator	Value	In Louisiana	In the US
Commute by Public Transit2024	0.0%	44 / 64	2,161 / 3,144
Households with No Vehicle2024	11.3%	8 / 64	150 / 3,144
Mean Commute Time2024minutes	23.2	51 / 64	1,779 / 3,143
Work from Home2024	5.5%	33 / 64	2,500 / 3,144

Other counties of Louisiana

Compare St. Mary Parish against every other county on a map, add layers and run a scatter — open the atlas. Sources and vintages for every figure on this page are listed under datasets, or browse all 3,144 counties.