St. Martin County GIS Maps
St. Martin County, Louisiana, has 51,767 residents and covers 737.2 square miles. The population declined 0.8% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for St. Martin County is 22099.
Breaux Bridge is the county's largest population center. St. Martin County also includes 3 zip codes, 1 public school district and 26 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
St. Martin County Trends
- Population
- 51,767▾
- Median Home Value
- $151,000▴
- K-12 Enrollment
- 6,680▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
St. Martin County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
St. Martin County Population
St. Martin County had 51,767 residents in 2020. That was 0.8% lower than in 2010. St. Martin County added 3,184 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 70 people per square mile. Some of the county's most populated postal areas include Breaux Bridge, Saint Martinville and Cade.
Population Trend in St. Martin County LA
St. Martin County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Martin County Zip Codes
St. Martin County has 3 zip codes. Some of the county's most populated zip codes include Breaux Bridge (70517), Saint Martinville (70582) and Cade (70519). Breaux Bridge is the largest zip by population, with about 26,434 residents or 51% of the county total. Together, the three largest zips account for about 88% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Martin County LA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 70517 | Breaux Bridge | 26,434 | ▾ -0.2% |
| 70582 | Saint Martinville | 19,088 | ▾ -3.5% |
| 70519 | Cade | 122 | ▾ -45% |
| Download all zip code data | |||
St. Martin County Zip Code populations and trends per most recent census data.
St. Martin County Demographics
St. Martin County has a median age of 39.7, which makes the county a little older than Louisiana overall. About 24.1% of residents are under 18, while 16.6% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 31.2% of the population, which points to a solid working-age base. About 15.3% of adults have a bachelor's degree or higher, above the statewide figure of 26.6%. The county is majority White by population, with Hispanic, Asian, Black and multiracial residents making up a meaningful share of the local mix.
Key Demographics for St. Martin County LA
Median Age
39.7
Under 18
24.1%
Age 65+
16.6%
Bachelor's+
15.3%
St. Martin County School Districts
St. Martin County is served by 1 public school district with 6,680 students enrolled in 2024. Several larger districts account for a substantial share of students across the county map area. Those three districts account for about 100% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in St. Martin County LA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| St. Martin Parish School District | 6,680 | 100% | ▾ -7.4% |
| Download all school district data | |||
St. Martin County school district enrollment and trends per most recent NCES reporting data.
St. Martin County Housing & Real Estate
St. Martin County has a median home value of $151,000 and a median gross rent of $865. About 79% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Louisiana median, while rents come in below the state average. In March 2026, the median listing price was $242,500 and homes spent about 69 days on the market.
St. Martin County Housing Mix
St. Martin County housing mix: owner, renter and vacant units.
St. Martin County Housing Trends
St. Martin County median home value and rent trend (last 5 years).
Businesses in St. Martin County, LA
St. Martin County has 1,691 business listings across 407 categories. The largest categories in St. Martin County business listings are Gas Stations (53, 3.1%), Churches & Religious Organizations (36, 2.1%), and Convenience Stores (31, 1.8%). The full St. Martin County business listings dataset includes names, categories, addresses and contact details where available. St. Martin County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in St. Martin County, LA
| Category | Businesses | Share |
|---|---|---|
| Gas Stations | 53 | 3.1% |
| Churches & Religious Organizations | 36 | 2.1% |
| Convenience Stores | 31 | 1.8% |
| Industrial Equipment | 30 | 1.8% |
| Parks & Recreation | 28 | 1.7% |
| Business Manufacturing And Supply | 24 | 1.4% |
| Discount Store | 22 | 1.3% |
| Auto Repair | 21 | 1.2% |
| Cajun And Creole Restaurant | 20 | 1.2% |
| Fast Food | 19 | 1.1% |
St. Martin County Business Listings
| Business | Category | City |
|---|---|---|
| Lotachrome Farm | Accommodation | St Martinville |
| Maraist & Maraist CPA's | Accountant | St Martinville |
| Graveyard Island, Belle River | Active Life | Baton Rouge |
| Le Video Store | Adult Entertainment | Breaux Bridge |
| I Promote U/Stewart Specialties | Advertising Agency | Broussard |
| Atlas Feed Mill | Agricultural Service | Breaux Bridge |
| Arrow Aviation Company | Aircraft Repair | Broussard |
| Breaux Bridge Lunch Box | American Restaurants | Breaux Bridge |
| McGee's Landing Atchafalaya Swamp Tours | Amusement Park | Breaux Bridge |
| St. Martin Animal Shelter | Animal Shelters | St Martinville |
| Download St. Martin County business listings | ||
St. Martin County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Martin County Data Package
This page shows a preview of what's included in the St. Martin County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border St. Martin County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.