Marion County


state capitol lit up at night
Evening at the State Capitol with the 75th Anniversary lighting on the Capitol Mall in Salem. (Oregon State Archives Photo)
County Seat: 100 High St. NE, Salem 97301
Phone: 503-588-5225 (General); 503-588-5105 (Court Administrator)
Fax: 503-373-4408


Population (2020): 349,120
Established: July 5, 1843
Elev. at Salem: 154'
Area: 1,194 sq. mi.
Average Temp.: January 39.3°  July 66.3°
Assessed Value: $27,997,769,590
Real Market Value: $47,864,280,366
(includes the value of non-taxed properties)
Annual Precipitation: 40.35"
Economy: Government, agriculture, food processing, forest products, manufacturing, education and tourism
Oregon county map with Marion County shaded

Related Resources

"County QuickFacts" (population and economic data from U.S. Census Bureau)
County Seat Map (from Google Maps)
County Map (from ODOT) 

Incorporated Cities

Points of Interest

State Capitol, Champoeg State Park, Silver Falls State Park, The Oregon Garden, Wheatland Ferry, Buena Vista Ferry, Detroit Dam and Santiam River, Breitenbush Hot Springs, Mount Angel Abbey, food processing plants, Willamette University, Chemeketa Community College, Willamette Heritage Center and Mission Mill Museum Village, Bush House, Deepwood House, Gilbert House Children’s Museum

History and General Information 

Marion County, then called Champooick, was created by the Provisional Government in 1843, sixteen years before Oregon gained statehood. In 1849, the name was changed to Marion in honor of General Francis Marion.

The county, located in the heart of the Willamette Valley, has the Willamette River as its western boundary and the Cascade Range on the east. Salem, the county seat, is one of the valley’s oldest cities. Among its public buildings are the Marion County Courthouse, State Capitol, Capitol Mall buildings and Salem Civic Center. The county was presided over by the Marion County Court until January 1, 1963, when the court was abolished and replaced by a Board of Commissioners.

County Officials

Commissioners—Danielle Bethell 2025, Colm Willis 2023, Kevin Cameron 2023; Dist. Atty. Paige Clarkson 2023; Assess. Tom Rohlfing 2025; Clerk Bill Burgess 2025; Justice of the Peace Justin Kidd 2025; Sheriff Joe Kast 2023; Surv. Kent Inman; Treas. Laurie Steele 2023; CFO Janice Fritz​