California

Lassen

32,730
2020 population
1870
first census record
16
census records

About Lassen

Lassen, California, first appears in the United States federal census in 1870, when it recorded a population of 1,327. At the most recent census, in 2020, its population stood at 32,730.

Its recorded population peaked at 34,895 in 2010, and has since declined by roughly 6 percent.

On the ground today, one documented military engagement has been recorded within the county, among them Pit River War — Battle of Infernal Caverns, and 6 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202032,730
201034,895
200033,828
199027,598
198021,661
197014,960
196013,597
195018,474
194014,479
193012,589
19208,507
19104,802
19004,511
18904,239
18803,340
18701,327
Source

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

Battles & engagements in Lassen

Military engagements that took place in Lassen, California.

Pit River War — Battle of Infernal Caverns
1867

Historic places in Lassen

National Register of Historic Places listings in Lassen, California.

Roop's Fort
Susanville
Susanville Railroad Depot
Susanville
Standish Hall
Standish
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Everything a full report reveals about Lassen County, California

This page charts the census history of Lassen County, California. 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 Lassen

When does Lassen first appear in the US census?
Lassen, California first appears in the federal census in 1870, with a recorded population of 1,327.
What is the population of Lassen?
At the most recent federal census (2020), Lassen had a recorded population of 32,730.
When did Lassen's population peak?
Lassen's recorded population peaked at 34,895 in 2010.
Were any battles fought in Lassen?
1 documented military engagement took place in Lassen, including Pit River War — Battle of Infernal Caverns.
How many historic places are in Lassen?
6 sites are listed on the National Register of Historic Places in Lassen, California.
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