Marion County, Oregon

Marion County
Marion County
County
	Marion County Courthouse in Salem
	Location within the U.S. state of Oregon
	Oregon's location within the U.S.
	Coordinates: 44°55′N 122°35′W / 44.91°N 122.58°W
Country	United States
State	Oregon
Founded	July 5, 1843
Named for	Francis Marion
Seat	Salem
Largest city	Salem
Area
• Total	1,194 sq mi (3,090 km2)
• Land	1,184 sq mi (3,070 km2)
• Water	10 sq mi (30 km2) 0.85%
Population (2020)
• Total	345,920
• Estimate (2023)	346,741
• Density	267/sq mi (103/km2)
Time zone	UTC−8 (Pacific)
• Summer (DST)	UTC−7 (PDT)
Congressional districts	5th, 6th
Website	www.co.marion.or.us

Marion County is one of the 36 counties in the U.S. state of Oregon. The population was 345,920 at the 2020 census,^[1] making it the 5th most populous county in Oregon. The county seat is Salem,^[2] which is also the state capital of Oregon. The county was originally named the Champooick District, after Champoeg (earlier Champooick^[3]), a meeting place on the Willamette River. On September 3, 1849, the territorial legislature renamed it in honor of Francis Marion,^[4] a Continental Army general from South Carolina who served in the American Revolutionary War.

Marion County is part of the Salem, OR Metropolitan Statistical Area, which is also included in the Portland-Vancouver-Salem, OR-WA Combined Statistical Area. It is located in the Willamette Valley.

^ "State & County QuickFacts". United States Census Bureau. Retrieved May 15, 2023.
^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
^ Horner, John B. (1919). Oregon: Her History, Her Great Men, Her Literature. Portland, Oregon: The J.K. Gill Co. p. 98.
^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. U.S. Government Printing Office. p. 200.