Louisiana

St. Mary

49,406
2020 population
1830
first census record
20
census records

About St. Mary

St. Mary, Louisiana, first appears in the United States federal census in 1830, when it recorded a population of 6,442. At the most recent census, in 2020, its population stood at 49,406.

Its recorded population peaked at 64,253 in 1980, and has since declined by roughly 23 percent.

On the ground today, 22 documented military engagements have been recorded within the county, among them Berwick Bay Naval Action (1862 — Seizure), Battle of Fort Bisland, Bisland — First Attack (Teche Line), and 32 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202049,406
201054,650
200053,500
199058,086
198064,253
197060,752
196048,833
195035,848
194031,458
193029,397
192030,754
191039,368
190034,145
189022,416
188019,891
187013,860
186016,816
185013,697
18408,950
18306,442
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

Battles & engagements in St. Mary

Military engagements that took place in St. Mary, Louisiana.

Berwick Bay Naval Action (1862 — Seizure)
1862
Battle of Fort Bisland
1863
Bisland — First Attack (Teche Line)
1863
Battle of Camp Bisland
1863
Action at Brashear City (Berwick)
1863
Bisland (Fort Bisland)
1863
Engagement at Bayou Black — Louisiana Naval Operations
1863
Berwick Bay Second Capture
1863
Battle of Irish Bend (Bayou Teche)
1863
Engagement at Berwick Bay — Recapture of CSS Queen of the West
1863
Recapture of Brashear City
1863
Battle of Berwick
1863
Battle of Fort Bisland (Bayou Teche)
1863
Battle of Bisland
1863
Fort Bisland Louisiana
1863
Bisland — Second Attack (Teche Breakthrough)
1863
Irish Bend
1863
Battle of Irish Bend
1863
Skirmish at Franklin (1863)
1863
Irish Bend Louisiana
1863
Engagement at Bayou Teche — Naval Component
1863
Battle of Franklin
1863

Historic places in St. Mary

National Register of Historic Places listings in St. Mary, Louisiana.

Southwest Reef Lighthouse
Berwick
Darby House
Baldwin
Dixie Plantation House
Franklin
Albania Plantation House
Jeanerette
Atkinson Memorial Presbyterian Church
Morgan City
Franklin Historic District
Franklin
Franklin Historic District (Boundary Increase)
Franklin
St. Mary's Episcopal Church
Franklin
Calumet Plantation House
Patterson
Alice C Planation House
Franklin
Grevemberg House
Franklin
Browse all Louisianahistoric sites ›

Other counties in Louisiana

Explore census history and historic records for more Louisiana counties.

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Everything a full report reveals about St. Mary County, Louisiana

This page charts the census history of St. Mary County, Louisiana. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
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Frequently asked about St. Mary

When does St. Mary first appear in the US census?
St. Mary, Louisiana first appears in the federal census in 1830, with a recorded population of 6,442.
What is the population of St. Mary?
At the most recent federal census (2020), St. Mary had a recorded population of 49,406.
When did St. Mary's population peak?
St. Mary's recorded population peaked at 64,253 in 1980.
Were any battles fought in St. Mary?
22 documented military engagements took place in St. Mary, including Berwick Bay Naval Action (1862 — Seizure), Battle of Fort Bisland, Bisland — First Attack (Teche Line).
How many historic places are in St. Mary?
32 sites are listed on the National Register of Historic Places in St. Mary, Louisiana.
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