List of Oregon counties

Counties of Oregon
MH BK WL UN UM MR GR HA LK KL DC CR JE WH GL SH WS HR ML CK MN LN LA DO JC JO CU CS BE LC PK YM TL WA CO CL
Location	State of Oregon
Number	36
Populations	1,430 (Wheeler) – 756,530 (Multnomah)
Areas	435 square miles (1,130 km2) (Multnomah) – 10,135 square miles (26,250 km2) (Harney)
Government	County government
Subdivisions	cities, towns, townships, unincorporated communities, indian reservations, census designated place

The following is a list of 36 counties in the U.S. state of Oregon. The Oregon Constitution does not explicitly provide for county seats; Article VI, covering the "Administrative Department" of the state of Oregon, simply states that:

More details on the etymologies of Oregon county names and place names in general are documented in Oregon Geographic Names. Oregon's postal abbreviation is OR and its FIPS state code is 41.

The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided with each entry. The FIPS code for each county links to census data for that county.