Oregon

Multnomah

815,428

2020 population

1860

first census record

census records

About Multnomah

Multnomah, Oregon, first appears in the United States federal census in 1860, when it recorded a population of 4,150. At the most recent census, in 2020, its population stood at 815,428.

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

On the ground today, 637 places are listed on the National Register of Historic Places.

Population by decade

Census Year	Population	Chart
2020	815,428
2010	735,334
2000	660,486
1990	583,887
1980	562,640
1970	556,667
1960	522,813
1950	471,537
1940	355,099
1930	338,241
1920	275,898
1910	226,261
1900	103,167
1890	74,884
1880	25,203
1870	11,510
1860	4,150

Source

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

Historic places in Multnomah

National Register of Historic Places listings in Multnomah, Oregon.

Senate Court Apartments

Portland

Genoa Building

Portland

Corbett, H. L. and Gretchen Hoyt, House

US Post Office-St. John's Station

Turner, Frederick, Fourplex

Portland

Clovelly Garden Apartments

Portland

McDougall, Alexander D., House

Jeanne Manor Apartment Building

Herschell-Spillman Noah's Ark Carousel

Portland

Malarkey, Daniel J., House

Portland

Corbett, Elliott R., House

Portland

Krouse, Nettie, Fourplex

Portland

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Everything a full report reveals about Multnomah County, Oregon

This page charts the census history of Multnomah 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 Multnomah

When does Multnomah first appear in the US census?

Multnomah, Oregon first appears in the federal census in 1860, with a recorded population of 4,150.

What is the population of Multnomah?

At the most recent federal census (2020), Multnomah had a recorded population of 815,428.

How many historic places are in Multnomah?

637 sites are listed on the National Register of Historic Places in Multnomah, Oregon.

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