Blog · September 24, 2026 · Louisiana
St. Tammany Parish, Louisiana GIS Parcel Map Guide
North-shore parcel research starts in the free St. Tammany Parish GeoPortal. Look up a Mandeville lot or wooded acreage near Folsom by address, owner or assessment number, check lines and flood exposure, and trace the plat at the Clerk of Court.
Main page: St. Tammany Parish, LA GIS & Parcel Viewer (official map link, St. Tammany Parish facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Across Lake Pontchartrain from New Orleans, St. Tammany Parish is known for pine forests, bayous, and towns that grew as the city’s north shore. People research it for family homes, larger wooded lots, and land out in the rural north. The parish Assessor GeoPortal is the official interactive parcel map.
The GeoPortal
The St. Tammany Parish GeoPortal is an interactive map that shows parcel boundaries, aerial imagery, and assessment information. Click a parcel to see its owner, assessment number, and property details. The parish assessor maintains the records behind it.
Platbookmapper lists it on the St. Tammany Parish row of our Louisiana directory; the national map will take you there too.
Parish, not county
Louisiana uses parishes instead of counties, and its property law comes from a civil-law tradition. Day to day, the parcel research process looks familiar: the assessor values property, and the Clerk of Court records deeds, mortgages, and other documents.
Search by address, owner or assessment number
- Open the GeoPortal.
- Search by address, owner, or assessment number.
- Click the parcel to view its owner, legal description, and assessed values.
- Switch to aerial imagery to see houses, woods, and water.
- Check any flood or reference layers available.
- Save the assessment number and a screenshot.
Covington, Mandeville, Slidell, and more
Covington is the parish seat, set among the rivers and pines of the western parish. Mandeville and Madisonville sit along the lakefront and the Tchefuncte River, and the Causeway bridge links Mandeville to Metairie. Slidell, the largest city, anchors the eastern parish near the Pearl River and the Mississippi line. Abita Springs, Folsom, Pearl River, Lacombe, and Bush fill in the rest. Northern St. Tammany is more rural, with horse farms, timber, and larger tracts.
How to find property lines in St. Tammany Parish
- Find the parcel in the GeoPortal and note the assessment number and legal description.
- Pull the act of sale and any recorded plat or survey from the Clerk of Court.
- On wooded lots, look for iron pipes or rods at the corners. Underbrush grows back fast.
- Hire a Louisiana licensed surveyor for fences, a new home site, or an elevation certificate.
Flood zones and wetlands first
Low-lying land, bayous, rivers, and the lakefront make flood risk the first question for most St. Tammany parcels. Hurricanes have brought storm surge to areas near the lake and the eastern marshes, and heavy rain can flood rivers and creeks. Check the FEMA flood zone and base flood elevation before you buy, and look at the aerial for wetlands, which can limit building and may require permits. Our flood zones guide explains the layers.
St. Tammany acreage map: pine woods, horse country and hunting land
In the northern parish around Folsom and Bush, buyers look for acreage for horses, gardens, or privacy. On the map, check road frontage, the shape of the tract, and whether a creek or wetland cuts across it. Timber tracts can be large and irregular. Our vacant land guide covers a checklist for rural parcels.
Hunting leases and permission requests start with the owner of record in the GeoPortal. Public hunting land, such as state wildlife management areas, is mapped by the Louisiana Department of Wildlife and Fisheries.
St. Tammany Parish plat book: recorded plats at the Clerk of Court
A parish plat book search almost always means a recorded subdivision plat or survey, and those are filed with the Clerk of Court. St. Tammany has no printed owner-name atlas. The GeoPortal is the free current ownership map. A Louisiana atlas and gazetteer helps on rural parish roads when you go out to look at timber or acreage.
How accurate is the GeoPortal?
It’s accurate enough to identify the parcel and read its assessment. It isn’t a survey. Parcels along bayous, the lakefront and wetlands are where drawn lines and the ground most often part ways, and elevation isn’t something a parcel map can tell you. Deeds and plats are recorded with the St. Tammany Parish Clerk of Court. A Louisiana licensed professional land surveyor sets boundaries and prepares elevation certificates when needed. For New Orleans, see our NOLA property viewer guide, and browse the Louisiana parish GIS hub.
Zoning and the tax map, briefly
Cities and towns handle zoning inside their limits, and St. Tammany Parish government handles unincorporated areas. Building near wetlands or in flood zones often requires additional review. The assessor’s property type is a tax classification, not zoning; contact the appropriate planning office with the parcel information in hand. See our zoning overlays guide.
East parish or west parish?
Where you land on the map often comes down to the commute. The Lake Pontchartrain Causeway, one of the longest bridges over water in the world, connects Mandeville to Metairie, while Slidell buyers tend to use Interstate 10 across the eastern end of the lake. West-parish neighborhoods around Covington and Mandeville are known for older trees and larger lots; the eastern parish around Slidell has more water-oriented subdivisions and canal lots. The Tammany Trace, a rail-trail linking several towns, and Fontainebleau State Park on the lakeshore are features buyers often look for on the map. Comparing a few parcels on each side in the GeoPortal gives you a quick sense of lot sizes and flood exposure.
Tips, and what to do if the GeoPortal won’t load
- Waterfront lots can raise bulkhead, pier, and shoreline permit questions; ask the parish before planning improvements.
- Some subdivisions have separate common-area parcels; check before assuming ownership of green space.
- Keep flood insurance quotes in mind; they can vary a lot between neighboring properties.
When the GeoPortal spins without drawing parcels, refresh the page, let the site open pop-up windows, and move to a computer if you’re on a phone. During storms, parish sites can be slow. The St. Tammany Parish row of our Louisiana directory keeps the current link.
Who uses the GeoPortal
Families moving from New Orleans, commuters comparing north-shore neighborhoods, horse-property buyers, builders, investors, surveyors, and title attorneys. Homeowners use it to check assessed values and compare neighbors.
Frequently asked questions
Who maintains the St. Tammany Parish parcel map?
The parish assessor maintains the parcel and assessment records shown in the GeoPortal.
Where are St. Tammany Parish deeds recorded?
With the St. Tammany Parish Clerk of Court, which records deeds and plats.
Why is my property line different on the GIS map?
Assessment maps are compiled for taxation and can be shifted from surveyed corners, especially near water and wetlands. The recorded plat and a survey control.
Open the official St. Tammany Parish GIS viewer St. Tammany Parish in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey — especially for fences, setbacks, or boundary disputes.