Louisiana · FIPS 22101 · Parish seat: Franklin
St. Mary Parish, LA GIS & Parcel Viewer
Looking for lot lines or a parcel number in St. Mary Parish, LA? The quickest route is the St. Mary Parish GeoPortal Maps viewer, the parish parcel map we keep on file for this parish. We link straight to it and add a few tips for getting around.
Open the St. Mary Parish parcel map ↗
Opens atlas.geoportalmaps.com in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | St. Mary Parish GeoPortal Maps viewer |
|---|---|
| Type | Parish-run map |
| Website | atlas.geoportalmaps.com |
| Access | Free, no login (checked Oct 2026) |
| Parish seat | Franklin |
| Population | 47,055 (2023 Census Bureau estimate) |
| Land area | 556 sq mi |
| FIPS code | 22101 |
Who runs this map
It is a county-level map: St. Mary Parish or the company it hires keeps the parcel layer up to date. When we tested the link in October 2026 it opened with no login and no fee.
Searching for a parcel, step by step
- Press the button above. This county's viewer runs on GeoPortal Maps; 17 counties in our directory use the same service.
- Find the search option and look up a property, or zoom in on the map.
- Click a lot to see its details.
- Check the toolbar for layers, measuring and printing.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
St. Mary Parish by the numbers
St. Mary Parish had an estimated 47,055 residents in 2023, according to the Census Bureau. With about 556 square miles of land, that works out to roughly 85 people per square mile. By population it ranks 23rd of 64 parishes in Louisiana. Another 564 square miles of water fall within its lines, according to Census mapping. Its parish seat is Franklin.
Parishes next to St. Mary Parish
If the property sits near a parish line, the parcel may belong to a neighbor. These parishes border St. Mary Parish:
Before you rely on the lines
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.