Multnomah County, Oregon

Multnomah County, Oregon
Location within the U.S. state of Oregon
Coordinates: 45°32′N 122°25′W / 45.54°N 122.41°W / 45.54; -122.41
Country United States
State Oregon
FoundedDecember 22, 1854
Named afterMultnomah people
SeatPortland
Largest cityPortland
Area
 • Total
466 sq mi (1,210 km2)
 • Land431 sq mi (1,120 km2)
 • Water34 sq mi (88 km2)  7.4%
Population
 (2020)
 • Total
815,428
 • Estimate 
(2024)
795,897
 • Density1,890/sq mi (730/km2)
Time zoneUTC−8 (Pacific)
 • Summer (DST)UTC−7 (PDT)
Congressional districts1st, 3rd, 5th
Websitewww.multco.us

Multnomah County /mʌltˈnmə/ is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the county's population was 815,428. Multnomah County is part of the Portland metropolitan area. It is the state's smallest and most populous county, and its county seat, Portland, is the state's most populous city.