Blog · October 14, 2026 · Louisiana
The St. Mary Parish Plat Book and the online parcel map
A printed atlas and the county viewer each have a place near Bayou Teche National Wildlife Refuge.
Main page: St. Mary Parish, LA GIS & Parcel Viewer (official map link, county 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.
Want a copy of the St. Mary Parish plat book? These atlases map who owns rural land, page by page, useful for farms near Glencoe. Covered here for St. Mary Parish: how the atlas is organized, where to find editions, and how the county viewer fills the gaps.
The St. Mary Parish plat book: start here
For acreage around Centerville, plat books are commercial atlases, with owner names on each tract, page by page across the parish.
Opening the official parcel viewer
Go first to the St. Mary Parish parcel viewer; it includes every assessed parcel in the parish, Bayou Vista included. If the land is near Amelia, type a street address, an owner's name or a parcel number, then pick the result to center the map on it. For a tract near Charenton, save the parcel ID before closing the panel; each office in the parish asks for it first.
What the map can't tell you
Parcel lines are drawn for taxes, not surveyed, so a tree line near Berwick often sits several feet off the line on screen. On ground around Vermilion Bay, owner names and values update on a schedule, so a deed recorded last month may not show yet.
Reading the legal description
Louisiana follows the Public Land Survey System, so deeds around Cypremort Point State Park reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though corrections make some sections near Bayou Teche National Wildlife Refuge odd-sized. Write down the legal description for the tract near Bayou Vista for any title or survey request.
Which office to call
For assessment questions about property around Morgan City go to the Parish Assessor, which maintains the tax roll. Questions about what you can build around Centerville need the planning or permitting office, town or parish, depending on location.
Finding a printed edition
Not every parish has a current edition, try the county extension office, recorder's office or library near Baldwin.
When a parcel crosses a boundary
St. Mary Parish touches Assumption Parish, Iberia Parish, St. Martin Parish, and Terrebonne Parish, all with their own assessor records. Ground near Glencoe that runs to the line may show up in two parish records, so check the adjacent map as well. For property near Vermilion Bay, our state page links every bordering parish map across Louisiana.
Common uses
Farmers, hunters and appraisers near Charenton use plat books to see ownership across many tracts at once.
Taking the map into the field
The parcel map usually runs in a mobile browser, which helps when you're standing on land near Bayou Teche National Wildlife Refuge, so load it before you lose signal. A saved image of the lot near Cypremort Point State Park and its lines is a good backup.
Current ownership online
You can search by owner name or click a tract near Bayou Teche National Wildlife Refuge, then print or screenshot it.
Not the same thing
Out toward Charenton, a plat book is not a recorded plat: the recorded plat at the Clerk of Court is a legal document, and the atlas is just a guide.
Places you'll see on the map
Franklin holds the county offices, home to the main records offices. Smaller places on the map include Morgan City, Patterson, Baldwin, and Berwick, where town lots give way to larger tracts. Roughly 47,055 people call St. Mary Parish home (Census Bureau estimate, 2023) on roughly 556 square miles. St. Mary Parish was formed in 1811, so old deeds can run back a long way. Places such as Vermilion Bay and Cypremort Point State Park help you orient on the aerial around Morgan City.
The paper trail behind a parcel
On ground around Patterson, the map is an index, not the title: recorded deeds, subdivision plats and easements for parcels in the parish are kept by the Clerk of Court. Around Bayou Teche National Wildlife Refuge, use the book and page from the tax record so staff can find the deed fast.
Printing your own
Print parcel views near Bayou Vista township by township to build your own up-to-date atlas.
Quick answers
Is there a current St. Mary Parish plat book?
For a home near Charenton, editions come and go; ask local offices.
Can I use a plat book for a boundary near Morgan City?
For acreage around Charenton, a survey sets boundaries, not an atlas; check the deed.
Is the online parcel map better than a plat book for land near Bayou Teche National Wildlife Refuge?
In most cases, the viewer covers town lots near Charenton too; many people use both.
Why does the plat book differ from the deed around Baldwin?
If you're looking near Glencoe, plat book acreage and lines are approximate; don't rely on them for boundaries.
Why don't the lines match my fence near Bayou Vista?
Out toward Morgan City, parcel lines are tax drawings, not surveys; a survey sets the real corners
Open the official St. Mary Parish, LA parcel map See it 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.