Oregon

Marion

345,920
2020 population
1850
first census record
18
census records

About Marion

Marion, Oregon, first appears in the United States federal census in 1850, when it recorded a population of 2,749. At the most recent census, in 2020, its population stood at 345,920.

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

On the ground today, 123 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020345,920
2010315,335
2000284,834
1990228,483
1980204,692
1970151,309
1960120,888
1950101,401
194075,246
193060,541
192047,187
191039,780
190027,713
189022,934
188014,576
18709,965
18607,088
18502,749
Source

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

Historic places in Marion

National Register of Historic Places listings in Marion, Oregon.

Union Street Railroad Bridge and Trestle
Salem
Salem Downtown State Street-Commercial Street Historic District
Salem
Lee Mission Cemetery
Salem
Odd Fellows Rural Cemetery (Additional Documentation)
Salem
Oregon State Fair Stadium and Poultry Building Ensemble (Additional Documentation)
Salem
Waller Hall, Willamette University
Salem
DeGuire, Murton E. and Lillian, House
Silverton
Aurora Colony Historic District
Aurora
Kay, Thomas, Woolen Mill
Salem
Methodist Mission Parsonage
Salem
Brown, Sam, House
Gervais
Chemawa Indian School Site
Salem
Elsinore Theater
Salem
Jones-Sherman House
Salem
Lee, Jason, House
Salem
Old Garfield School
Salem
Port, Dr. Luke A., House
Salem
St. Mary's Roman Catholic Church
Mount Angel
Boon, John D., House
Salem
Oregon State Hospital Historic District
Salem
Gallon House Bridge
Silverton
Boon Brick Store
Salem
Oregon State Capitol
Salem
St. Pierre, Edward W., House
Salem
Browse all Oregonhistoric sites ›

Other counties in Oregon

Explore census history and historic records for more Oregon counties.

WheelerYamhillBakerBentonClackamasClatsopColumbiaCoosCrookCurryDeschutesDouglasGilliamGrantHarneyHood RiverJacksonJeffersonJosephineKlamath
Unlimited access

Everything a full report reveals about Marion County, Oregon

This page charts the census history of Marion 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.
First month just $5.99, then $11.99 a month. Unlimited locations, cancel anytime.

Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.

Start your Marion County, Oregon report
Or see a real report first

Explore Oregon records

Oregonhistory ›NRHP historic sites ›Notable people from Oregon›

Frequently asked about Marion

When does Marion first appear in the US census?
Marion, Oregon first appears in the federal census in 1850, with a recorded population of 2,749.
What is the population of Marion?
At the most recent federal census (2020), Marion had a recorded population of 345,920.
How many historic places are in Marion?
123 sites are listed on the National Register of Historic Places in Marion, Oregon.
Aubrey Research

Research the history of any US location

Aubrey searches federal archives, archaeological records, historic registers, and primary sources to build a full historical report for any address or place in the United States.

Research your locationView a free sample report