California

Siskiyou

44,076
2020 population
1860
first census record
17
census records

About Siskiyou

Siskiyou, California, first appears in the United States federal census in 1860, when it recorded a population of 7,629. At the most recent census, in 2020, its population stood at 44,076.

Its recorded population peaked at 44,900 in 2010, and has since declined by roughly 2 percent.

On the ground today, 40 documented military engagements have been recorded within the county, among them Scott River Fight, Salmon River Massacres — Trinity County (1852), Scott River Massacre — Shasta County (1852), and 20 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202044,076
201044,900
200044,301
199043,531
198039,732
197033,225
196032,885
195030,733
194028,598
193025,480
192018,545
191018,801
190016,962
189012,163
18808,610
18706,848
18607,629
Source

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

Battles & engagements in Siskiyou

Military engagements that took place in Siskiyou, California.

Scott River Fight
1851
Salmon River Massacres — Trinity County (1852)
1852
Scott River Massacre — Shasta County (1852)
1852
Tule Lake Engagement (Modoc Prelude)
1859
Modoc War – Battle at Lost River
1872
Modoc War – First Battle of the Stronghold
1873
Battle of Dry Lake
1873
Modoc War — Thomas-Wright Massacre (April 26, 1873)
1873
Modoc War — Killing of General Canby at Peace Talks (April 11, 1873)
1873
Modoc War — First Battle of the Stronghold (January 17, 1873)
1873
Modoc War — Scarfaced Charley's Ambush / Thomas-Wright Massacre (April 26, 1873)
1873
Modoc War – Attack on Peace Commission
1873
Modoc War – Battle of Dry Lake
1873
Modoc War — Dry Lake Battle
1873
Modoc War — Lava Beds Siege
1873
Modoc War — Second Battle of the Stronghold (April 15–17, 1873)
1873
First Battle of the Stronghold
1873
Modoc War — Captain Jack's Stronghold
1873
Modoc War – Thomas-Wright Massacre
1873
Modoc War – Sorass Lake Engagement
1873
Second Battle of the Stronghold
1873
Battle of Sand Butte
1873
Thomas-Wright Ambush
1873
Modoc War — Second Battle of the Stronghold (April 15–17, 1873)
1873
Modoc Peace Commission Massacre
1873
Final Battle of the Lava Beds
1873
Modoc War — Thomas-Wright Massacre
1873
Thomas-Wright Massacre (Modoc War)
1873
Murder of Peace Commissioners (Modoc)
1873
Modoc War — Killing of Gen. Canby
1873
Modoc War — First Battle of the Stronghold (January 17, 1873)
1873
Modoc War — Peace Commission Murders (April 11, 1873)
1873
Modoc War – Second Battle of the Stronghold
1873
Thomas–Wright Massacre
1873
Modoc War — Battle of Sand Buttes
1873
Massacre of Peace Commission
1873
Modoc War — Battle of the Lava Beds 1872-1873
1873
Thomas-Wright Massacre
1873
Modoc War – Ambush of Peace Commission
1873
Modoc War – Canby's Assassination
1873

Historic places in Siskiyou

National Register of Historic Places listings in Siskiyou, California.

McCloud
McCloud
Captain Jack's Stronghold
Tulelake
Sawyers Bar Catholic Church
Sawyers Bar
Forest House
Yreka
Lower Klamath National Wildlife Refuge
Dorris
Hotel Macdoel
Macdoel
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Other counties in California

Explore census history and historic records for more California counties.

MercedModocMonoMontereyNapaNevadaOrangePlacerPlumasRiversideSacramentoSan BenitoSan BernardinoSan DiegoSan FranciscoSan JoaquinSan Luis ObispoSan MateoSanta BarbaraSanta Clara
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Everything a full report reveals about Siskiyou County, California

This page charts the census history of Siskiyou 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 Siskiyou

When does Siskiyou first appear in the US census?
Siskiyou, California first appears in the federal census in 1860, with a recorded population of 7,629.
What is the population of Siskiyou?
At the most recent federal census (2020), Siskiyou had a recorded population of 44,076.
When did Siskiyou's population peak?
Siskiyou's recorded population peaked at 44,900 in 2010.
Were any battles fought in Siskiyou?
40 documented military engagements took place in Siskiyou, including Scott River Fight, Salmon River Massacres — Trinity County (1852), Scott River Massacre — Shasta County (1852).
How many historic places are in Siskiyou?
20 sites are listed on the National Register of Historic Places in Siskiyou, California.
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