Louisiana

St. Tammany

264,570
2020 population
1820
first census record
21
census records

About St. Tammany

St. Tammany, Louisiana, first appears in the United States federal census in 1820, when it recorded a population of 1,723. At the most recent census, in 2020, its population stood at 264,570.

The county's recorded population has risen across the decades to its highest level in 2020.

On the ground today, 2 documented military engagements have been recorded within the county, among them Madisonville Skirmish, Madisonville Naval Skirmish (Lake Pontchartrain), and 45 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020264,570
2010233,740
2000191,268
1990144,508
1980110,869
197063,585
196038,643
195026,988
194023,624
193020,929
192020,645
191018,917
190013,335
189010,160
18806,887
18705,586
18605,406
18506,364
18404,598
18302,864
18201,723
Source

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

Battles & engagements in St. Tammany

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

Madisonville Skirmish
1862
Madisonville Naval Skirmish (Lake Pontchartrain)
1862

Historic places in St. Tammany

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

New Orleans and Northeastern-New Orleans and Great Northern Railroad Depot
Slidell
Claiborne Cottage Hotel
Covington
Camp Salmen House
Slidell
Division of St. John Historic District (Additional Documentation)
Covington
Abita Springs Pavilion
Abita Springs
Abita Springs Historic District
Abita Springs
Fontainebleau State Park
Mandeville
Tchefuncte Site
Mandeville
Saint Joseph Abbey Church
Saint Benedict
Madisonville Town Hall
Madisonville
Griffin's Bakery
Mandeville
Dew Drop Social and Benevolent Hall
Mandeville
Cousin, Francois, House
Slidell
Johnson House
Mandeville
Christ Episcopal Church
Covington
Moore House
Mandeville
Madisonville Bank
Madisonville
Lacombe School
Lacombe
Dendinger House
Madisonville
Browse all Louisianahistoric sites ›

Other counties in Louisiana

Explore census history and historic records for more Louisiana counties.

St. JamesSt. John the BaptistSt. LandrySt. MartinSt. MaryTangipahoaTensasTerrebonneUnionVermilionVernonWashingtonWebsterWest Baton RougeWest CarrollWest FelicianaWinnAcadiaAllenAscension
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Everything a full report reveals about St. Tammany County, Louisiana

This page charts the census history of St. Tammany 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. Tammany

When does St. Tammany first appear in the US census?
St. Tammany, Louisiana first appears in the federal census in 1820, with a recorded population of 1,723.
What is the population of St. Tammany?
At the most recent federal census (2020), St. Tammany had a recorded population of 264,570.
Were any battles fought in St. Tammany?
2 documented military engagements took place in St. Tammany, including Madisonville Skirmish, Madisonville Naval Skirmish (Lake Pontchartrain).
How many historic places are in St. Tammany?
45 sites are listed on the National Register of Historic Places in St. Tammany, Louisiana.
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