County Maps US

Multnomah County, Oregon

The most populous of Oregon's 36 counties.

CountyFIPS 41051

Within Oregon
Multnomah County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Portland, the county seat, located via the 2025 Census Gazetteer.

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Population
795,391
-20,870 (-2.6%) since 2020
Land area
431
square miles. A further 7.3% of the total area is water
Population density
1,845
people per square mile, computed rather than published
County seat
Portland
Seat of county government.
Established
1854
171 years ago
Largest city
Portland city
Population 632,627 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Multnomah County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Multnomah County, Oregon from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 358 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Multnomah County ranks

Position among the 36 counties of Oregon, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn OregonNationally
Population795,3911st of 3682nd of 3,144
Land area431 sq mi36th of 362,359th of 3,144
Population density1,845 per sq mi1st of 3680th of 3,144
Median household income$88,7666th of 36334th of 3,143

Full data for Multnomah County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population795,391Vintage 2025 Population Estimates
Population in 2020816,261Vintage 2025 Population Estimates
2020 estimates base?815,400Vintage 2025 Population Estimates
Land area431 sq mi2025 Gazetteer Files
Water area34.0 sq mi2025 Gazetteer Files
Total area465 sq mi2025 Gazetteer Files
Population density?1,845 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$88,766American Community Survey 2020-2024 5-Year Estimates
Median home value$552,700American Community Survey 2020-2024 5-Year Estimates
Median age38.7American Community Survey 2020-2024 5-Year Estimates
Households349,803American Community Survey 2020-2024 5-Year Estimates
Housing units371,179American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+223
6,846 births, 6,623 deaths
Net migration
+619
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Multnomah County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Clackamas CountyOregon48 mi426,280
Clark CountyWashington33 mi532,119
Washington CountyOregon29 mi611,708
Skamania CountyWashington18 mi12,669
Hood River CountyOregon18 mi23,720
Columbia CountyOregon8.6 mi54,091

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

Side by side

All 36 counties of Oregon

Open the interactive Oregon county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.