St. Martin County, LA demographics:
population, income, and more

Total population
73,307
0.2% year-over-year change
Median household income
$55,308/yr
0.3% year-over-year change
Housing units
32,349
0.8% year-over-year change

St. Martin County population

How many people live in St. Martin County

St. Martin County is home to 73,307 residents, according to the most recent Census data. Gender-wise, 50.1% of St. Martin County locals are male, and 49.9% are female.

Total population
73,307
0.2% year-over-year change
Gender ratio
Male
50.1%
36,758
Female
49.9%
36,549
Value Percent YoY change
Male 36,758 50.1% 0.0%
Female 36,549 49.9% 0.3%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in St. Martin County is 38, with the population distributed as follows: about 21% are children under 15, then 12.1% are in the 15 to 24 age group. Adults between 25 and 44 make up 26.3% of the population, while another 25.4% fall into the 45 to 64 bracket. Finally, around 15.3% are 65 or older.

Median age
38.4
Age breakdown
Under 15
21%
15 to 24
12.1%
25 to 44
26.3%
45 to 64
25.4%
Over 65
15.3%
Value Percent YoY change
Under 15 15,372 21% -1.2%
15 to 24 8,840 12.1% -0.1%
25 to 44 19,253 26.3% -2.5%
45 to 64 18,603 25.4% 1.4%
Over 65 11,239 15.3% 5.2%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In St. Martin County, 97.7% of the population are US-born citizens, while 1% have gained naturalized citizenship. At the same time, 1.3% of residents are non-citizens. As for race, 66.4% of locals are Caucasian, 25.7% are African American and 1.1% have Asian roots. Another 0.1% are Indigenous American, 0.1% are Pacific Islanders, while 0.8% identify as another race. There’s also a share of 5.7% that includes residents with two or more races.

Citizenship
U.S.-born citizens
97.7%
Non-U.S.-born citizens
1%
Non-citizens
1.3%
Value Percent YoY change
U.S.-born citizens 71,638 97.7% 0.3%
Non-U.S.-born citizens 726 1% 7.6%
Non-citizens 943 1.3% -11.8%
Racial breakdown
White
66.4%
Black or African American
25.7%
American Indian and Alaska Native
0.1%
Asian
1.1%
Native Hawaiian and other Pacific Islander
0.1%
Two or more races
5.7%
Other
0.8%
Value Percent
White 48,704 66.4%
Black or African American 18,865 25.7%
American Indian and Alaska Native 104 0.1%
Asian 828 1.1%
Native Hawaiian and other Pacific Islander 48 0.1%
Two or more races 4,211 5.7%
Other 547 0.8%

Households in St. Martin County

A peek inside St. Martin County households

St. Martin County has 27,766 households, with an average of 2 members in each. Of these, 66.9% are families, while the remaining 33.1% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
27,766
-0.6% year-over-year change
Average people per household
2
Non-family households
9,192
Family households
18,574
Value Percent YoY change
Non-family households 9,192 33.1% -4.5%
Family households 18,574 66.9% 1.5%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in St. Martin County

The housing landscape of St. Martin County

St. Martin County's housing consists of 32,349 units, with 73.2% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 0.5% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 20.9% of the housing landscape.

Housing units
32,349
0.8% year-over-year change
Housing types
Value Percent
1 unit, detached 23,667 73.2%
1 unit, attached 166 0.5%
2 units 378 1.2%
3 or 4 units 621 1.9%
5 to 9 units 389 1.2%
10 to 19 units 47 0.2%
20 to 49 units 201 0.6%
50 or more units 105 0.3%
Mobile home 6,775 20.9%
Homes built since 2020
913
52.2% year-over-year change

The age of buildings in St. Martin County

In St. Martin County, the median construction year is 1986. About 3.8% of homes were built before the 1940s, with another 4.3% going up by 1949. Most development happened in the second half of the 20th century. Then, 16.7% of homes were added from 2000 to 2009, 16.1% between 2010 and 2019, and 2.8% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,229 3.8% 3.7%
Built between 1940 and 1949 1,393 4.3% 4.7%
Built between 1950 and 1959 2,125 6.6% -2.8%
Built between 1960 and 1969 3,235 10% -3.0%
Built between 1970 and 1979 4,225 13.1% 5.5%
Built between 1980 and 1989 4,319 13.4% 3.3%
Built between 1990 and 1999 4,298 13.3% -6.0%
Built between 2000 and 2009 5,415 16.7% -7.5%
Built between 2010 and 2019 5,197 16.1% 7.4%
Built in 2020 or later 913 2.8% 52.2%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

St. Martin County occupancy rates

Out of the 27,766 occupied housing units in St. Martin County, 79% are owner-occupied, while 21% are lived in by tenants. Meanwhile, 14.2% of all homes on the local market sit vacant.

Occupied housing units
27,766
-0.6% year-over-year change
Occupancy breakdown
Renter occupied
5,826
Owner occupied
21,940
Value Percent YoY
change
Renter occupied 5,826 21% 1.6%
Owner occupied 21,940 79% -1.1%
Unoccupied housing units
14.2%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

St. Martin County housing costs

Housing costs in St. Martin County come to a median of $693 per month, while tenants specifically pay a median gross rent of $872.

Median housing costs per month
$693/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in St. Martin County
$872/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in St. Martin County

St. Martin County education at a glance

About 50.5% of the population in St. Martin County went to high school, while 18.2% pursued college studies. Another 7% earned an associate degree and 14.6% hold a bachelor’s. Meanwhile, 4.7% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 2,753 5% -3.5%
High school diploma 27,644 50.5% -1.5%
College diploma 9,957 18.2% 1.7%
Associate degree 3,805 7% 4.0%
Bachelor's degree 7,986 14.6% 2.4%
Graduate degree 2,574 4.7% 10.1%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in St. Martin County

How much people earn in St. Martin County

The average annual household income in St. Martin County was $86,925 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +2.7% change from the previous year. At the same time, the median income stood at $55,308, reflecting a +0.3% shift over the same period.

Average household income in St. Martin County
$86,925/year
2.7% year-over-year change
Median household income in St. Martin County
$55,308/year
0.3% year-over-year change

St. Martin County income by age

In St. Martin County, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $80,642. Those with someone between 45 and 64 in charge, often well established professionally, earn $59,803 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $28,789, while those led by someone over 65, many of whom may be retired, have about $38,220 in earnings. Overall, 83.7% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $28,789 -27.6%
25 - 44 $80,642 -11.4%
45 - 64 $59,803 10.1%
Over 65 $38,220 4.1%
Above poverty level
59,742
Below poverty level
11,671
Value Percent YoY
change
Above poverty level 59,742 83.7% 1.5%
Below poverty level 11,671 16.3% -5.4%

Employment in St. Martin County

Workforce and job types in St. Martin County

72.1% of the working population are employed in professional or administrative positions, while 27.9% are in hands-on or service-based jobs. Also, 13.9% run their own businesses, 66.8% are employed by private companies, and 14.1% work in the public sector.

Workforce demographics

White collar
23,876
Blue collar
9,244
Value Percent YoY change
White collar 23,876 72.1% 1.4%
Blue collar 9,244 27.9% -6.4%
Employer type
Self employees
13.9%
Private companies
66.8%
Governmental workers
14.1%
Not for profit companies
5.1%
Value Percent YoY change
Self employees 4,616 13.9% 5.1%
Private companies 22,126 66.8% -2.8%
Governmental workers 4,682 14.1% 0.8%
Not for profit companies 1,696 5.1% 5.6%

Transportation in St. Martin County

How people get around in St. Martin County

In St. Martin County, the average commute time is 45 minutes. Commuting methods vary: 97.7% of residents travel by personal vehicle and 1.8% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
45 min
-29.7% year-over-year change
Means of transportation
Value Percent YoY change
Car 29,379 97.7% -2.7%
Taxicab 19 0.1% 26.7%
Bus or trolleybus 3 0% -81.2%
Ferryboat 85 0.3% 112.5%
Bicycle 40 0.1% -2.4%
Walk 537 1.8% -7.7%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in St. Martin County by zipcode?

Zipcode Population Number of households Median income Average income
70512 10,740 3,799 $47,313 $69,530
70517 26,024 9,586 $60,778 $78,139
70518 17,263 6,419 $106,710 $126,282
70519 71 55 $0 $0
70582 19,209 7,907 $49,837 $73,750

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FAQs about St. Martin County demographics 

What is the total population of St. Martin County?

St. Martin County has a total population of 73,307 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +0.2% compared to a year ago.

What is the gender ratio in St. Martin County?

The gender ratio in St. Martin County is as follows:
  • 50.1% males (36,758 residents)
  • 49.9% females (36,549 residents)

What is the median age in St. Martin County?

The median age in St. Martin County is 38.4.

What is the age distribution of the population in St. Martin County?

The age distribution in St. Martin County is as follows:
  • Under 15: 21% (15,372 residents)
  • Ages 15-24: 12.1% (8,840 residents)
  • Ages 25-44: 26.3% (19,253 residents)
  • Ages 45-64: 25.4% (18,603 residents)
  • Over 65: 15.3% (11,239 residents)

What is the racial and ethnic makeup of St. Martin County?

The racial and ethnic makeup of St. Martin County is as follows:
  • White: 66.4% (48,704 residents)
  • Black or African American: 25.7% (18,865 residents)
  • American Indian and Alaska Native: 0.1% (104 residents)
  • Asian: 1.1% (828 residents)
  • Native Hawaiian and Other Pacific Islander: 0.1% (48 residents)
  • Two or More Races: 5.7% (4,211 residents)
  • Other: 0.8% (547 residents)

What percentage of the population in St. Martin County are U.S.-born citizens?

U.S.-born citizens represent 97.7% of the population in St. Martin County.

How many housing units are there in St. Martin County?

There are 32,349 housing units in St. Martin County, reflecting a +0.8% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in St. Martin County and what is the average household size?

St. Martin County has a total of 27,766 households, with an average of 2 people in each.

What is the median household income in St. Martin County?

St. Martin County has a median household income of $55,308, representing a +0.3% shift from the previous year, according to the U.S. Census Bureau.

What is the job market overview for St. Martin County?

Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 72.1% (23,876 residents)
  • Blue-collar workers: 27.9% (9,244 residents)

Places of employment:
  • Self-employed: 13.9% (4,616 residents)
  • Private companies: 66.8% (22,126 residents)
  • Governmental workers: 14.1% (4,682 residents)
  • Not-for-profit companies: 5.1% (1,696 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025