St. Tammany County GIS Maps
St. Tammany County, Louisiana, has 264,570 residents and covers 846.2 square miles. The population grew 13.2% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for St. Tammany County is 22103.
Slidell is the county's largest population center. St. Tammany County also includes 16 zip codes, 1 public school district and 27 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. Tammany County Trends
- Population
- 264,570▴
- Median Home Value
- $272,200▴
- K-12 Enrollment
- 35,956▾
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. Tammany 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. Tammany County Population
St. Tammany County had 264,570 residents in 2020. That was 13.2% higher than in 2010. St. Tammany County added 73,302 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 313 people per square mile. Some of the county's most populated postal areas include Covington, Slidell and Slidell.
Population Trend in St. Tammany County LA
St. Tammany County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Tammany County Zip Codes
St. Tammany County has 16 zip codes. Some of the county's most populated zip codes include Covington (70433), Slidell (70458) and Slidell (70461). Covington is the largest zip by population, with about 41,423 residents or 16% of the county total. Together, the three largest zips account for about 42% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Tammany County LA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 70433 | Covington | 41,423 | ▴ 33.1% |
| 70458 | Slidell | 37,798 | ▴ 7.8% |
| 70461 | Slidell | 30,740 | ▴ 10.5% |
| 70448 | Mandeville | 25,670 | ▴ 3.3% |
| 70471 | Mandeville | 23,334 | ▴ 9.1% |
| Download all zip code data | |||
St. Tammany County Zip Code populations and trends per most recent census data.
St. Tammany County Demographics
St. Tammany County has a median age of 40.4, which makes the county a little older than Louisiana overall. About 23.8% of residents are under 18, while 18% 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 30.6% of the population, which points to a solid working-age base. About 36.6% 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. Tammany County LA
Median Age
40.4
Under 18
23.8%
Age 65+
18%
Bachelor's+
36.6%
St. Tammany County School Districts
St. Tammany County is served by 1 public school district with 35,956 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. Tammany County LA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| St. Tammany Parish School District | 35,956 | 100% | ▾ -7.3% |
| Download all school district data | |||
St. Tammany County school district enrollment and trends per most recent NCES reporting data.
St. Tammany County Housing & Real Estate
St. Tammany County has a median home value of $272,200 and a median gross rent of $1,305. About 79% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Louisiana median, while rents come in above the state average. In March 2026, the median listing price was $333,500 and homes spent about 63 days on the market.
St. Tammany County Housing Mix
St. Tammany County housing mix: owner, renter and vacant units.
St. Tammany County Housing Trends
St. Tammany County median home value and rent trend (last 5 years).
Businesses in St. Tammany County, LA
St. Tammany County has 11,925 business listings across 919 categories. The largest categories in St. Tammany County business listings are Real Estate Agents (289, 2.4%), Churches & Religious Organizations (205, 1.7%), and Medical Offices (173, 1.5%). The full St. Tammany County business listings dataset includes names, categories, addresses and contact details where available. St. Tammany 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. Tammany County, LA
| Category | Businesses | Share |
|---|---|---|
| Real Estate Agents | 289 | 2.4% |
| Churches & Religious Organizations | 205 | 1.7% |
| Medical Offices | 173 | 1.5% |
| Contractors | 171 | 1.4% |
| Insurance Agencies | 161 | 1.4% |
| Beauty Salons | 157 | 1.3% |
| Hair Salons | 133 | 1.1% |
| Dental Offices | 126 | 1.1% |
| Auto Repair | 126 | 1.1% |
| Gas Stations | 122 | 1.0% |
St. Tammany County Business Listings
| Business | Category | City |
|---|---|---|
| Alchemy Addiction Recovery | Abuse And Addiction Treatment | Slidell |
| Ibis Trail | Accommodation | Covington |
| Bob Jones Accounting & Income Tax | Accountant | Slidell |
| Aquafly New Orleans | Active Life | Slidell |
| Green Heron Clinic | Acupuncture | Mandeville |
| Mmo of Covington | Addiction Rehabilitation Center | Covington |
| Acorn Adoption | Adoption Services | Mandeville |
| Slidell Adult Superstore | Adult Entertainment | Slidell |
| Adult Emporium | Adult Store | Mandeville |
| Outdoor Cover Warehouse | Adventure Sports Center | Slidell |
| Download St. Tammany County business listings | ||
St. Tammany County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Tammany County Data Package
This page shows a preview of what's included in the St. Tammany 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. Tammany County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.