St. Mary Parish, Louisiana Demographics 2026

Name: St. Mary Parish, Louisiana Demographics
Creator: U.S. Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

St. Mary Parish, Louisiana has a population of 47,828, the 23rd most populous county in Louisiana. The median household income is $52,576 and the median home value is $138,900. The poverty rate is 20.8%.

Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes

St. Mary Parish Quick Facts

Population 47,828

Median Household Income $52,576

Median Home Value $138,900

Poverty Rate 20.8%

Unemployment Rate 5.4%

Median Age 39.7 years

Homeownership Rate 68.6%

Affordability Ratio 2.6x

Bachelor's Degree+ 13.7%

High School Graduation 80.3%

Cities/Places 11

Population 47,828 23rd of 64

Median Income $52,576 13% lower than state

Poverty Rate 20.8%

Unemployment 5.4%

How St. Mary Parish Changed

Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.

Metric	2019–2023	2020–2024	Change
Population	48,455	47,828	-1.3%
Median household income	$51,768	$52,576	+1.6%
Median home value	$128,000	$138,900	+8.5%

Median Household Income

St. Mary Parish

$52,576

$60,756

National

$80,734

Median Home Value

St. Mary Parish

$138,900

$216,500

National

$332,700

Economy & Housing

Household Income Distribution

Under $25K 24.8%

$25K-$50K 22.7%

$50K-$100K 29.1%

$100K+ 23.4%

Detailed income brackets

Under $10K

7.5%

$10K-$15K

7.8%

$15K-$20K

4.3%

$20K-$25K

5.1%

$25K-$30K

6.1%

$30K-$35K

5.1%

$35K-$40K

4.3%

$40K-$45K

3.5%

$45K-$50K

3.7%

$50K-$60K

7.6%

$60K-$75K

9.6%

$75K-$100K

11.8%

$100K-$125K

10.8%

$125K-$150K

4.3%

$150K-$200K

4.4%

$200K+

3.9%

Employment

5.4% Unemployment Rate State: 6.3%|National: 5.2%

54.2% Labor Force Participation

Housing Overview

Owner 68.6%

Renter 31.4%

Affordability Index Very Affordable

2.6x home value to income ratio

Median gross rent $848/mo 19.4% of median household income annually

People & Demographics

Age Distribution

Under 18

24.5%

18-34

19.1%

35-54

23.5%

55-74

25.5%

75+

7.5%

Race & Ethnicity

Diversity Index

High Diversity

A diverse community with significant representation from multiple racial and ethnic groups.

State average: 59 | National average: 61

Education

Educational Attainment (Adults 25+)

Cities & Places in St. Mary Parish

City	Population	Median Income	Poverty	Home Value
Franklin	6,461	$39,518	27.3%	$104,400
Patterson	5,744	$49,886	22.9%	$160,400
Berwick	4,607	$51,580	18.6%	$212,400
Bayou Vista	3,842	$40,500	24.6%	$144,700
Baldwin	1,962	$31,669	26.9%	$129,400
Amelia	1,712	$55,472	18.0%	$87,500
Charenton	1,440	$63,463	12.3%	$122,400
Centerville	685	$74,509	24.5%	$320,400
Sorrel	564	$62,578	15.1%	N/A
Siracusaville	515	$78,085	0.0%	$95,000
Glencoe	144	$30,742	6.9%	$9,999

Explore Louisiana Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

St. Mary Parish is located in Louisiana with a total population of 47,828. It is the 23rd most populous county out of 64 in Louisiana. The county encompasses 11 Census-designated places.

Age Demographics

The median age in St. Mary Parish is 39.7 years. This is 4% higher than the state median of 38.0 years.

Economy, Income & Housing

The median household income in St. Mary Parish is $52,576. This is 13% lower than the state median of $60,756. It is also 35% lower than the national median of $80,734. The poverty rate stands at 20.8%. This is 10% higher than the state poverty rate of 18.9%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 5.4%. This is 15% lower than the state rate of 6.3%. The median home value is $138,900. Housing costs are 36% lower than the state median of $216,500. With a home-value-to-income ratio of just 2.6x, St. Mary Parish is one of the most affordable housing markets in the area. 68.6% of occupied housing units are owner-occupied. This homeownership rate is 2% higher than the state average of 67.4%.

Race & Ethnicity

The largest racial or ethnic group in St. Mary Parish is White (non-Hispanic), making up 53.4% of the population. Black or African American residents account for 28.8%.

Education

13.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 50% lower than the state rate of 27.0%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 80.3%.

Data Sources & Methodology

All figures for St. Mary Parish come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Louisiana and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.

Frequently Asked Questions

What is the population of St. Mary Parish, Louisiana?

St. Mary Parish has a population of 47,828, making it the 23rd most populous county in Louisiana.

What is the median income in St. Mary Parish?

The median household income in St. Mary Parish is $52,576 with a poverty rate of 20.8%.

How many cities are in St. Mary Parish, Louisiana?

St. Mary Parish contains 11 Census-designated places.