NAME	FORMED	PARENT	COUNTY SEAT
BAKER	1862	Wasco	Baker City
BENTON	1847	Polk	Corvallis
CHAMPOEG	1843	Renamed Marion in 1849	-
CLACKAMAS	1843	Original County	Oregon City
CLATSOP	1844	Tuality	Astoria
COLUMBIA	1854	Washington	St. Helens
COOS	1853	Jackson, Umpqua	Coquille
CROOK	1882	Wasco	Prineville
CURRY	1855	Coos	Gold Beach
DESCHUTES	1916	Crook	Bend
DOUGLAS	1852	Umpqua	Roseburg
GILLIAM	1885	Wasco, Morrow	Condon
GRANT	1864	Umatilla, Wasco	Canyon City
HARNEY	1889	Grant	Burns
HOOD RIVER	1908	Wasco	Hood River
JACKSON	1852	Umpqua	Medford
JEFFERSON	1914	Crook	Madras
JOSEPHINE	1856	Jackson	Grants Pass
KLAMATH	1882	Lake	Klamath Falls
LAKE	1874	Jackson, Wasco	Lakeview
LANE	1851	Linn, Umpqua, Benton	Eugene
LINCOLN	1893	Benton, Polk	Newport
LINN	1847	Champoeg	Albany
MALHEUR	1887	Baker	Vale
MARION	1843	Originaly Champoeg	Salem
MORROW	1885	Umatilla	Heppner
MULTNOMAH	1854	Clackamas, Washington	Portland
POLK	1845	Yamhill	Dallas
SHERMAN	1889	Wasco	Moro
TILLAMOOK	1853	Clatsop, Yamhill, Polk	Tillamook
TUALITY	1843	Renamed Washington in 1849	-
UMATILLA	1862	Wasco	Pendleton
UMPQUA	1851	Became part of Douglas in 1862	-
UNION	1864	Baker	La Grande
WALLOWA	1887	Union	Enterprise
WASCO	1854	Marion, Clackamas, Linn	The Dalles
WASHINGTON	1843	Originaly Tuality	Hillsboro
WHEELER	1899	Crook, Gilliam, Grant	Fossil
YAMHILL	1843	Original County	McMinnville
UNKNOWN COUNTY