Select Page

History and Facts of Oregon Counties

Oregon Counties – The Oregon Territory was organized on August 14, 1848 and was admitted the union as the 33rd state on February 14, 1859.

Oregon currently has 36 Counties. States bordering Oregon are CaliforniaIdahoNevada and Washington.

In 1843 the first Oregon counties were formed. They were Clackamas CountyMarion CountyWashington County and Yamhill County. The last county to be formed was Deschutes County in 1916.

List of Oregon Counties

Oregon is divided into 36 counties.

List of Old Former / Extinct Oregon Counties

Oregon has counties that no longer are in existence. A lot of these counties were established and disbanded within the 19th century; county borders have modified very little since 1900 in the vast most of states.

The below Oregon counties no longer exist:

?? County, Oregon

Created ? from ?. It was abolished ? and re-established as ? County on ?.

  • Umpqua County, Oregon – created 1851, gradually reduced in size until 1862, when what remained was incorporated into Douglas County
  •  
  •  

Map of Oregon County Boundary Changes from 1843 to 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 the creation of Oregon from 1843-1975.

Fun Facts about Oregon Counties

County Name Facts

The County names:

  • 0 of them named for Native American words or people,
  •  

Counties by Year

In 1843 the first Oregon counties were formed. They were Clackamas CountyMarion CountyWashington County and Yamhill County. The last county to be formed was Deschutes County in 1916.

  • ? County was the first county created on ?.
  •  The last county to be formed was ? County on ?.
  •  

Facts for County Size

  • ? County (000 sq mi) is the largest county in Oregon.
  • ? County (000 sq mi) is the smallest county in Oregon.

Facts for County Population (2017 Est.)

  • ? County (000) is the most populated county in Oregon.
  • ? County (000) is the least populated county in Oregon.

Facts for Oregon Counties and Cities

Oregon’s 36 largest cities (2036) are:

  1. Birmingham (000) is in ? County and ? Counties
  2. Portland, Eugene, Salem, Gresham, Hillsboro, Beaverton, Bend, Medford, Springfield and Corvallis