County Seat: 501 SE Hawthorne Blvd., Portland 97214
Phone: 503-823-4000 (General); 503-988-3957 (Court Administrator)
Population (2013): 756,530
Established: Dec. 22, 1854
Elev. at Portland: 77'
Area: 465 sq. mi.
Average Temp.: January 38.9° July 67.7°
Assessed Value: $69,210,609,494
Real Market Value: $108,173,728,101
Annual Precipitation: 37.39"
Economy: Manufacturing, transportation, wholesale and retail trade, and tourism
Historical Records Inventory
"County QuickFacts" (population and economic data from U.S. Census Bureau)
County Seat Map (from Yahoo! Maps)
County Map (from ODOT)
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, Oregon Convention Center, Moda Center Arena
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 percent 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 Mt. Hood.
Commissioners—Jules Bailey 2017, Chair Deborah Kafoury 2019, Diane McKeel 2017, Judy Shiprack 2017, Loretta Smith 2019; Dist. Atty. Rodney Underhill 2017; Sheriff Dan Staton 2019; Auditor Steve March 2019; Assess. Randy Walruff; Recorder Ron Weldon; Surv. James Clayton; Treas./CFO Mark Campbell; CIO Sherry Swackhamer