Demographics of St. Martin Parish, Louisiana

St. Martin Parish, Louisiana had 51,106 people on July 1, 2025, by the Census Bureau’s estimate: −510 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

St. Martin Parish, in four figures

51,106
Population: July 1, 2025, Vintage 2025 estimate.; −1.0%
Change since July 2020: −510 people.; 40.1 ±0.6
Median age: ACS 2020–⁠2024.; $55,960 ±$5,042
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

St. Martin Parish, Louisiana's population shrank 1.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of St. Martin Parish, Louisiana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

St. Martin Parish, Louisiana's population shrank 1.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of St. Martin Parish, Louisiana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	51,616	100.0	100.0
2021	51,571	99.9	100.2
2022	51,307	99.4	100.7
2023	51,151	99.1	101.6
2024	51,301	99.4	102.5
2025	51,106	99.0	103.1

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Population of St. Martin Parish, Louisiana on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	51,616	−134	+3	0	−135
2021	51,571	−45	−31	+13	−65
2022	51,307	−264	+24	+70	−349
2023	51,151	−156	+48	+88	−280
2024	51,301	+150	+76	+140	−60
2025	51,106	−195	+61	+69	−321

Age, 2020–2024

The median age is 40.1 ±0.6: for men 39.6 ±0.8 and for women 40.5 ±0.7. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in St. Martin Parish by age, ACS 2020–2024
Age	People	Share	Louisiana	United States
Under 5	3,166 ±40	6.2% ±0.1	6.2% ±<0.1	5.6% ±<0.1
5 to 17	9,170 ±514	17.9% ±1.0	17.3% ±0.1	16.3% ±<0.1
18 to 24	4,019 ±388	7.8% ±0.8	9.1% ±0.1	9.1% ±<0.1
25 to 44	12,928 ±545	25.2% ±1.1	26.6% ±0.1	26.9% ±<0.1
45 to 64	13,236 ±561	25.8% ±1.1	24.1% ±0.1	24.8% ±<0.1
65 and over	8,834 ±529	17.2% ±1.0	16.7% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $55,960 ±$5,042, and income per person $31,041 ±$1,634, in 2024 dollars. The median is $60,756 ±$408 in Louisiana and $80,734 ±$166 in the United States.

Households by income

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Households in St. Martin Parish by income, ACS 2020–2024
Household income	Households	Share	Louisiana	United States
Under $25,000	4,511 ±553	23.0% ±2.8	22.4% ±0.3	14.6% ±<0.1
$25,000 to $49,999	4,404 ±524	22.5% ±2.6	20.2% ±0.3	16.7% ±<0.1
$50,000 to $74,999	3,181 ±522	16.2% ±2.6	15.9% ±0.2	15.5% ±<0.1
$75,000 to $99,999	2,304 ±391	11.8% ±2.0	11.7% ±0.2	12.6% ±<0.1
$100,000 to $149,999	2,601 ±374	13.3% ±1.9	14.8% ±0.3	17.5% ±<0.1
$150,000 to $199,999	1,596 ±336	8.2% ±1.7	7.3% ±0.2	9.6% ±<0.1
$200,000 or more	982 ±202	5.0% ±1.0	7.8% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in St. Martin Parish by age, ACS 2020–2024
Age	Below poverty	Rate	Louisiana	United States
All ages	7,790 ±976	15.3% ±1.9	18.9% ±0.3	12.5% ±0.1
Under 18	2,170 ±371	17.7% ±2.8	25.4% ±0.5	16.1% ±0.1
18 to 59	3,623 ±615	13.6% ±2.3	17.7% ±0.3	11.6% ±0.1
60 and over	1,997 ±327	16.6% ±2.6	15.2% ±0.3	11.0% ±<0.1

Housing, 2020–2024

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Housing in St. Martin Parish, ACS 2020–2024
Measure	St. Martin Parish	Louisiana	United States
Housing units	23,828 ±38	2,108,902 ±333	143,775,355 ±10,234
Occupied	82.2% ±2.0	85.6% ±0.2	89.9% ±0.1
Vacant	17.8% ±2.0	14.4% ±0.2	10.1% ±0.1
Owner occupied	77.7% ±2.3	67.4% ±0.4	65.2% ±0.3
Renter occupied	22.3% ±2.9	32.6% ±0.3	34.8% ±0.1
Median home value	$164,200 ±$6,482	$216,500 ±$1,367	$332,700 ±$236
Median gross rent	$870 ±$50	$1,064 ±$8	$1,413 ±$2
Median year built	1986 ±2	1983 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in St. Martin Parish by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Louisiana	United States
Hispanic or Latino	1,873 ±0	3.6% ±<0.1	7.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	32,398 ±302	63.1% ±0.6	55.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	14,690 ±299	28.6% ±0.6	30.5% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	390 ±100	0.8% ±0.2	1.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	28 to 128	0.1% to 0.2%	0.4% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 126	0% to 0.2%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	42 to 310	0.1% to 0.6%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,700 ±428	3.3% ±0.8	3.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in St. Martin Parish by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Louisiana	United States
Born in the state	46,251 ±591	90.1% ±1.2	77.2% ±0.2	57.3% ±<0.1
Born in another state	3,934 ±525	7.7% ±1.0	17.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	228 ±108	0.4% ±0.2	0.7% ±<0.1	1.7% ±<0.1
Born abroad	940 ±235	1.8% ±0.5	4.9% ±0.1	14.1% ±<0.1
Naturalized citizens	262 ±55	0.5% ±0.1	2.0% ±0.1	7.4% ±<0.1
Not citizens	678 ±233	1.3% ±0.5	2.9% ±0.1	6.8% ±<0.1

St. Martin Parish among the counties of Louisiana

20th of 64 by population, July 2025. Every one is listed on the Louisiana page.

Counties of Louisiana near St. Martin Parish in population, July 2025
County	July 2025	Change since 2020
Lafourche Parish	95,505	−2.0%
St. Landry Parish	80,765	−1.9%
Iberia Parish	66,846	−4.6%
Vermilion Parish	57,671	+1.3%
Acadia Parish	57,032	−0.8%
St. Martin Parish	51,106	−1.0%
St. Charles Parish	50,586	−3.7%
Lincoln Parish	48,360	+0.1%
St. Mary Parish	46,552	−5.3%
St. Bernard Parish	45,642	+4.1%
Vernon Parish	45,091	−7.3%

Elsewhere on the site

Rankings this appears in

No. 6 Counties in Louisiana by homeownership rate
No. 12 Counties in Louisiana by median age
No. 14 Counties in Louisiana by median household income
No. 15 Counties in Louisiana by per capita income
No. 19 Counties in Louisiana by median rent
No. 20 Counties by population in Louisiana

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026