Washington

Cowlitz

110,730
2020 population
1860
first census record
17
census records

About Cowlitz

Cowlitz, Washington, first appears in the United States federal census in 1860, when it recorded a population of 406. At the most recent census, in 2020, its population stood at 110,730.

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

On the ground today, 30 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020110,730
2010102,410
200092,948
199082,119
198079,548
197068,616
196057,801
195053,369
194040,155
193031,906
192011,791
191012,561
19007,877
18905,917
18802,062
1870730
1860406
Source

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

Historic places in Cowlitz

National Register of Historic Places listings in Cowlitz, Washington.

Laughlin Round Barn
Castle Rock
Klager, Hulda, Lilac Gardens
Woodland
Nutty Narrows Bridge
Longview
Longview Bridge
Longview
Long, Robert Alexander, High School
Longview
Longview Women's Clubhouse
Longview
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Other counties in Washington

Explore census history and historic records for more Washington counties.

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Everything a full report reveals about Cowlitz County, Washington

This page charts the census history of Cowlitz County, Washington. 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 Cowlitz

When does Cowlitz first appear in the US census?
Cowlitz, Washington first appears in the federal census in 1860, with a recorded population of 406.
What is the population of Cowlitz?
At the most recent federal census (2020), Cowlitz had a recorded population of 110,730.
How many historic places are in Cowlitz?
30 sites are listed on the National Register of Historic Places in Cowlitz, Washington.
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