County Seat: 1200 SW First Ave., Portland 97204
Phone: 503-823-4000 (General); 503-988-3957 (Court Administrator)
Population (2020): 829,560
Established: Dec. 22, 1854
Elev. at Portland: 77'
Area: 465 sq. mi.
Average Temp.: January 38.9° July 67.7°
Assessed Value: $89,783,658,820
Real Market Value: $195,651,290,147
(includes the value of non-taxed properties)
Annual Precipitation: 37.39"
Economy: Manufacturing, transportation, wholesale and retail trade, and tourism
Points of Interest
Oregon History Center, Oregon Museum of Science and Industry, Oregon Zoo, Portland Art Museum, Washington Park, International Rose Test Gardens, Japanese Gardens, Columbia River Gorge, Multnomah Falls, Blue Lake Park, Oxbow Park, Pittock Mansion, Port of Portland, Memorial Coliseum and Rose Quarter, Oregon Convention Center, Moda Center Arena, Vista House
History and General Information
Lewis and Clark made note of “Multnomah,” the tribal village on Sauvie Island, in 1805 and applied that name to all tribal people of the area. The name is derived from “nematlnomaq,” probably meaning “downriver.” Multnomah County was created from parts of Washington and Clackamas counties by the Territorial Legislature in 1854, five years before Oregon became a state, because citizens found it inconvenient to travel to Hillsboro to conduct county business.
The county is both the smallest in size and largest in population in Oregon. Over 50% of its people live in Portland, a busy metropolis dominated by rivers and greenery. The remaining area includes picturesque rural land, from pastoral farms on Sauvie Island to the rugged Columbia River Gorge and the western slopes of Mount Hood.
Commissioners—Chair Deborah Kafoury 2023, Sharon Meieran 2025, Susheela Jayapal 2023, Lori Stegmann 2025, Jessica Vega Pederson 2025; Dist. Atty. Mike Schmidt 2025; Sheriff Mike Reese 2023; Auditor Jennifer McGuirk 2023; Assess. Michael Vaughn; Elections Director Tim Scott; Recorder Ellenmarie Murray; Surv. James Clayton; Attorney Jenny Madkour; Engineer Ian Cannon