Oregon

Clackamas

421,401
2020 population
1850
first census record
18
census records

About Clackamas

Clackamas, Oregon, first appears in the United States federal census in 1850, when it recorded a population of 1,859. At the most recent census, in 2020, its population stood at 421,401.

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

On the ground today, 93 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020421,401
2010375,992
2000338,391
1990278,850
1980241,919
1970166,088
1960113,038
195086,716
194057,130
193046,205
192037,698
191029,931
190019,658
189015,233
18809,260
18705,993
18603,466
18501,859
Source

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

Historic places in Clackamas

National Register of Historic Places listings in Clackamas, Oregon.

Zigzag Ranger Station
Zigzag
Dibble, Horace L., House
Molalla
Cross, Harvey, House
Oregon City
Upper Sandy Guard Station Cabin
Government Camp
Timberline Lodge
Government Camp
Silcox Hut
Timberline Lodge
Vonder Ahe, Fred, House and Summer Kitchen
Molalla
Willamette Falls Locks
West Linn
Clackamas Lake Ranger Station Historic District
Government Camp
Bagby Guard Station
Estacada
McLoughlin Promenade
Oregon City
Kinsman, John and Elizabeth, House
Milwaukie
Smith, R. S., Motor Company Building
Sandy
Rock Creek Methodist Church
Molalla
St. John the Evangelist Roman Catholic Church
Zigzag
Ermatinger, Francis, House
Oregon City
Barlow, William, House
Canby
Canemah Historic District
Oregon City
Hall-Chaney House
Milwaukie
Oregon City Municipal Elevator
Oregon City
Oregon Iron Company Furnace
Lake Oswego
Holmes, William L., House
Oregon City
River Mill Hydroelectric Project
Estacada
Willamette River (Oregon City) Bridge (No. 357)
Oregon City
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Other counties in Oregon

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Everything a full report reveals about Clackamas County, Oregon

This page charts the census history of Clackamas County, Oregon. 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 Clackamas

When does Clackamas first appear in the US census?
Clackamas, Oregon first appears in the federal census in 1850, with a recorded population of 1,859.
What is the population of Clackamas?
At the most recent federal census (2020), Clackamas had a recorded population of 421,401.
How many historic places are in Clackamas?
93 sites are listed on the National Register of Historic Places in Clackamas, Oregon.
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