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|Territory: Aug 14, 1848|
|Statehood: Feb 14, 1859|
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Today’s Oregon counties did not always exist in the present form. They went through many different changes in the space of a few short years.
Oregon Territorial Counties
In 1843 the first Oregon counties were formed.
The State of Oregon entered the union as the 46th state on February 14, 1859.
Oregon Counties Today
Fun Facts about Oregon Counties
Counties by Year
- Clackamas, Marion, Washington and Yamhill Counties was the original 4 counties created on July 05, 1843.
- Deschutes County was the last county created on 1916.
County Size Facts
- Multnomah County (435 sq mi) is the largest county in Oregon.
- Harney County (10,135 sq mi) is the smallest county in Oregon.
County Population Facts
- Wheeler County (1,465) is the least populated county in Oregon.
- Multnomah County (790,670) is the most populated county in Oregon.
Oregon City Facts
Oregon’s 10 largest cities (2018 est.) are:
- Portland (653,115) is in Multnomah County, Washington County and Clackamas County
- Salem (173,442) is in Marion County and Polk County
- Eugene (171,245) is in Lane County
- Gresham (110,158) is in Multnomah County
- Hillsboro (108,389) is in Washington County
- Beaverton (98,962) is in Washington County
- Bend (97,590) is in Deschutes County
- Medford (82,347) is in Jackson County
- Springfield (62,979) is in Lane County
- Corvallis (58,641) is in Benton County
Boundary Changes of Oregon Counties from 1843-1975
This Interactive Map of Oregon Counties show the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from 1843 to 1975.
List of Oregon Counties
|County||Created||Created From||Named For||County Seat||Notes|
|Baker County||22 Sep 1862||Wasco County (Union and Malheur Counties)||In honor of Edward Dickinson Baker (1811-1861); served in the U.S. House of Representatives from Illinois and later as a U.S. Senator from Oregon and a U.S. Army colonel during both the Mexican–American War and the American Civil War.||Baker City||Later, Union County and Malheur County were created from this county. The boundaries were adjusted for the last time in 1901, when the area between the Powder River and the Wallowa Mountains was returned to Baker County|
|Benton County||23 Dec 1847||Polk County||In honor of Thomas Hart Benton (1782-1858), a U.S. senator who advocated U.S. control over the Oregon Country||Corvallis|
|Clackamas County||05 Jul 1843||One of the original four districts of the Oregon Country||Clackamas Indians, a Native American tribe living in the area||Oregon City|
|Columbia County||22 Jun 1844||Twality District||Clatsop tribe of Native Americans, who lived along the coast of the Pacific Ocean prior to European settlement||Astoria|
|Coos County||16 Jan 1854||Washington County||Columbia River, which forms the county’s eastern and northern borders||Saint Helens|
|Crook County||22 Dec 1853||Umpqua and Jackson Counties||Coos Tribe of Native Americans who lived in the region||Coquille|
|Clatsop County||24 Oct 1882||Wasco County||In honor of George Crook (1828-1890), a major general in the American Civil War and the Indian Wars||Prineville|
|Curry County||18 Dec 1855||Coos County||In honor of George Law Curry (1820-1878), a governor of the Oregon Territory||Gold Beach|
|Deschutes County||13 Dec 1916||Crook County||The word “Riviere des Chutes”, French for “River of the Falls”||Bend|
|Douglas County||07 Jan 1852||Umpqua County||In honor of Stephen A. Douglas (1813-1861), a U.S. Senator who supported Oregon statehood||Roseburg|
|Gilliam County||25 Feb 1885||Wasco County||in honor of Cornelius Gilliam (1798-1848), a pioneer who commanded the forces of the Provisional Government of Oregon after the Whitman Massacre||Condon|
|Grant County||14 Oct 1864||Wasco and Umatilla Counties||In honor of Ulysses S. Grant (1822 – 1885), army officer who served in the Oregon Territory; a Union general in the American Civil War, and 18th President of the United States (1869-1877)||Canyon City|
|Harney County||25 Feb 1889||Southern two-thirds of Grant County||In honor of William S. Harney (1800-1889); a Tennessee-born cavalry officer in the U.S. Army during the Indian Wars, Mexican–American War, and American Civil War||Burns|
|Hood River County||23 Jun 1908||Wasco County||Hood River (a tributary of the Columbia River), which flows through the county||Hood River|
|Jackson County||28 Sep 2020||southwestern portion of Lane County and the unorganized area south of Douglas and Umpqua Counties||In honor of Andrew Jackson (1767–1845); a major general in the War of 1812 and the seventh President of the United States (1829-1837)||Medford|
|Jefferson County||12 Dec 1914||Crook County||Mount Jefferson, which is located on its western boundary||Madras|
|Josephine County||22 Jan 1856||Jackson County||iIn honor of Virginia “Josephine” Rollins, the first white woman to make this county her home||Grants Pass|
|Klamath County||17 Oct 1882||Lake County||Klamath or Clamitte tribe, which has had a presence in the area for 10,000 years||Klamath Falls|
|Lake County||24 Oct 1874||Jackson and Wasco Counties||The numerous lakes and hot springs||Lakeview|
|Lane County||29 Jan 1851||Linn and Benton Counties||In honor of Joseph Lane (1801–1881); a brigadier general in the Mexican-American War and the first governor of Oregon Territory||Eugene|
|Lincoln County||20 Feb 1893||Benton and Polk Counties||In honor of Abraham Lincoln (1809 – 1865), the 16th President of the United States (1861-1865)||Newport|
|Linn County||28 Dec 1847||Champoeg County||In honor of Lewis F. Linn (1795-1843); a U.S. Senator for Missouri and author of the Donation Land Act, which provided free land to settlers in the West||Albany|
|Malheur County||17 Feb 1887||Baker County||Malheur River (formally “Riviere au Malheur” or “Unfortunate River”), named by French trappers whose property and furs were stolen from their river encampment||Vale|
|Marion County||05 Jul 1843||One of the original four districts of the Oregon territory||In honor of Francis Marion (1732–1795), a brigadier general in the American Revolutionary War and was known as “The Swamp Fox”||Salem||Originally named Champooick District later Champoeg County, it was renamed to Marion County in 1849|
|Morrow County||16 Feb 1885||Umatilla and Wasco Counties||In honor of Jackson L. Morrow, a state representative who advocated for the formation of the county||Heppner|
|Multnomah County||22 Dec 1854||Washington and Clackamas Counties||The Indian village of Multnomah, on Sauvie Island. The word is derived from “nematlnomaq”, probably meaning “downriver”||Portland|
|Polk County||22 Dec 1845||Yamhill District||In honor of James Knox Polk (1795–1849), 11th President of the United States (1845-1849)||Dallas|
|Sherman County||25 Feb 1889||Wasco County||In honor of William Tecumseh Sherman (1820-1891); a major general in the American Civil War, a businessman, educator, and author||Moro|
|Tillamook County||15 Dec 1853||Clatsop, Yamhill, and Polk Counties||Tillamook (or Killamook) Native American people||Tillamook|
|Umatilla County||27 Sep 1862||Wasco County||Sahaptin word, possibly meaning “laughing waters”||Pendleton|
|Union County||14 Oct 1864||Baker County||The town of Union, which had been established two years before and named by its founders for the “Union” of the states during the Civil War||La Grande|
|Wallowa County||11 Feb 1887||Union County||Nez Perce word “wallowa” to designate a tripod of poles used to support fish nets. The area was claimed by the Chief Joseph band of the Nez Perce as its hunting and fishing grounds||Enterprise|
|Wasco County||11 Jan 1854||Clackamas, Lane, Linn, and Marion Counties||Wasco (or Wascopam) Native American tribe||The Dalles|
|Wheeler County||17 Feb 1899||Grant, Gilliam, and Crook Counties||In honor of Henry H. Wheeler, who operated the first mail stage line from The Dalles to Canyon City||Hillsboro|
|Washington County||05 Jul 1843||Grant, Gilliam, and Crook Counties||In honor of George Washington (1732 – 1799); commanding general of the Continental Army during the American Revolutionary War, a Founding Father, and first President of the United States (1789-1797)||Fossil|
|Yamhill County||05 Jul 1843||One of the original four districts of the Oregon Country||Yamhelas, members of the Kalapuya Native American family, who lived along the Yamhill River in the western Willamette Valley||McMinnville|
List of Old Former / Extinct Oregon Counties
Oregon contains some counties that no longer exist because they were discontinued, renamed or merged with another county. These are important for genealogy research purposes.
The below counties formerly within the area of the State of Oregon no longer exist:
Umpqua County, Oregon
Created in 1851, gradually reduced in size until 1862, when what remained was incorporated into Douglas County.