St. Martin Parish, Louisiana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 21st-largest in Louisiana
The population of St. Martin Parish, Louisiana is 51,559 as of the 2023 American Community Survey, making it the 21st-largest county in Louisiana. The median household income is $53,394, the median home value is $151,000, and the median age is 39.7.
The population of St. Martin Parish has declined 2.0% since 2010 (52,263 → 51,218), a -0.14% annualized rate.
51,559
Population
-0.14%
Annual growth
70
People / sq mi
$53,394
Median Income
$151,000
Median Home Value
St. Martin Parish covers 738 sq mi of land at 69.9 people per square mile.
About St. Martin Parish, LA
St. Martin Parish is distinguished by its share of foreign-born residents, 7.9% of the population. With 51,559 residents, St. Martin Parish is a county in Louisiana. It ranks #21 among counties in Louisiana by population.
The typical household earns $53,394, below the US median of $78,538. About 11.4% of residents live below the federal poverty level, below the national 12.4%. Median home value is $151,000, with typical rent around $865.
College attainment is 15.3%, below the national 35.0%. Around 6.3% of workers work from home, below the national 14.0%, and the average commute runs about 28 minutes each way.
St. Martin Parish Population History (2010-2024)
The county of St. Martin Parish had a population of 52,263 in 2010 and 51,218 in 2024, a -2.0% growth over 14 years. The peak was 54,125 in 2017. Average annual growth rate: -0.14%.
51,218
Population (2024)
52,263
Population (2010)
54,125
Peak (2017)
-0.14%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 52,263 |
| 2011 | 52,804 |
| 2012 | 52,664 |
| 2013 | 52,950 |
| 2014 | 53,309 |
| 2015 | 53,891 |
| 2016 | 53,829 |
| 2017 | 54,125 |
| 2018 | 53,629 |
| 2019 | 53,497 |
| 2020 | 51,614 |
| 2021 | 51,550 |
| 2022 | 51,260 |
| 2023 | 51,122 |
| 2024 | 51,218 |
Race & Ethnicity
| White | 64.8% |
| Black or African American | 28.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
39.7
Median Age
50.9%
Female
49.1%
Male
16.6%
Age 65+
Age Distribution
Children (under 15): 20.0% · Seniors (65+): 16.6%
Income & Poverty
| Median household income | $53,394$-6,629 vs state |
| Mean household income | $74,226 |
| Per-capita income | $29,983 |
| Poverty rate | 11.4%-2.8% vs state |
| Unemployment rate | 3.0% |
| Employment-to-population | 55.8% |
Top Industries by Employment
The largest employment sector in St. Martin Parish is professional & business services, accounting for 19.7% of workers.
How residents commute
0.2%
Drive alone
1.2%
Carpool
84.8%
Public transit
6.3%
Work from home
28.0 min
Avg commute
Housing
$151,000$-57,700 vs state
Median home value
$865
Median rent
78.9%
Homeownership rate
23,704
Total housing units
84.2%
Occupied
15.8%
Vacant
21.1%
Renter-occupied
Social & access
93.3%
With health insurance
87.1%
With broadband internet
7.9%
Foreign-born
5.9%
Veterans (18+)
16.9%
With a disability
88.8%
Speak language other than English at home
Education
82.9%
High School+
15.3%
Bachelor's+
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Frequently Asked Questions
St. Martin Parish, Louisiana has a population of 51,559 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 21st-largest county in Louisiana. Population density is 70 people per square mile.
The population of St. Martin Parish has declined 2.0% since 2010 (52,263 → 51,218), a -0.14% annualized rate.
The median household income in St. Martin Parish, Louisiana is $53,394, with mean (average) household income of $74,226 and per-capita income of $29,983. 11.4% of residents live below the federal poverty level.
In St. Martin Parish, the largest racial and ethnic groups are White (64.8%), Black or African American (28.6%), Hispanic or Latino (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in St. Martin Parish, Louisiana is 39.7 years. Residents are 50.9% female and 49.1% male.
The median home value in St. Martin Parish is $151,000 and median monthly rent is $865. 78.9% of occupied housing units are owner-occupied. The county has 23,704 total housing units, 15.8% of which are vacant.
The largest employment sector in St. Martin Parish, Louisiana is professional, scientific, and management services, employing 19.7% of workers. The unemployment rate is 3.0%.
New Orleans is among the largest cities associated with St. Martin Parish, Louisiana, with a population of 376,035.
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Statewide data for Louisiana
Population, race, income, age, and trends across Louisiana
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.