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Oregon County Creation Dates and Parent Counties

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Note
 See an interactive outline map of Oregon Historical Counties at Newberry Library site[1] (Free) Enter a year, Refresh Map, select zoom in, then click on the map to enlarge it.


Tip
 Sort the table by Date Formed or by Parent Counties and check Boundary Changes for interesting insights.
Name of County Date Formed Boundary
Changes 		Parent County Counties Created by Boundary Changes
Baker 1862 Sep 22 Details Wasco Malheur 1887, Union 1864
Benton 1847 Dec 23 Details Polk Lincoln 1893, Umpqua 1851
Champoeg 1843 Jul 05 Details Oregon Country Linn 1847, renamed Marion 1849
Clackamas 1843 Jul 05 Details Oregon Country Multnomah 1854, Wasco 1854
Clark 1843 Jul 05 Details Oregon Country now in Washington State
Clatsop 1844 Jun 22 Details Twality Tillamook 1853
Columbia 1854 Jan 16 Details Washington none
Coos 1853 Dec 22 Details Umpqua, Jackson Curry 1855
Crook 1882 Oct 24 Details Wasco Deschutes 1916, Jefferson 1914, Wheeler 1899
Curry 1855 dec 18 Details Coos none
Deschutes 1916 Dec 13 Details Crook none
Douglas 1852 Jan 07 Details Umpqua Wasco 1854
Gilliam 1885 Feb 25 Details Wasco Wheeler 1899
Grant 1864 Oct 14 Details Wasco, Umatilla Harney 1889, Wheeler 1899
Harney 889 Feb 23 Details Grant none
Hood River 1908 Jun 23 Details Wasco none
Jackson 1852 Jan 12 Details Umpqua Coos 1853, Josephine 1856, Lake 1874, Wasco 1854
Jefferson 1914 Dec 12 Details Crook none
Josephine 1856 Jan 22 Details Jackson none
Klamath 1882 Oct 17 Details Lake none
Lake 1874 Oct 24 Details Jackson, Wasco Klamath 1882
Lane 1851 Jan 28 Details Linn, Umpqua Wasco 1854
Lewis 1845 Dec 09 Details Oregon Country now in Washington State
Lincoln 1893 Feb 20 Details Benton, Polk none
Linn 1847 Dec 28 Details Champoeg Lane 1851, Umpqua 1851, Wasco 1854
Malheur 1887 Feb 17 Details Baker none
Marion 1849 Sep 03 Details renamed from Champoeg Wasco 1854
Morrow 1885 Feb 16 Details Umatilla none
Multnomah 1854 Dec 22 Details Washington, Clackamas none
Polk 1845 Dec 22 Details Yamhill Benton 1847, Lincoln 1893, Tillamook 1853
Sherman 1889 Feb 25 Details Wasco none
Tillamook 1853 Dec 15 Details Clatsop, Polk, Yamhill none
Twality 1843 Jul 05 Details Oregon Country renamed Washington 1845
Umatilla 1862 Sep 27 Details Wasco Grant 1864, Morrow 1885
Umpqua 1851 Jan 28 Details Benton, Linn Coos 1853, Douglas 1852, Jackson 1852, Lane 1851, dissolved into Douglas 1863
Union 1864 Oct 14 Details Baker Wallowa 1887, Baker 1901
Wallowa 1887 Feb 11 Details Union none
Wasco 1854 Jan 11 Details Clackamas, Marion, Linn, Lane, Douglas, Lewis County, Washington, Clark County, Washington (entire area east of Cascades) Baker 1862, Crook 1882, Gilliam 1855, Grant 1864, Hood River 1908, Lake 1874, Sherman 1889, Umatilla 1862
Washington 1845 Dec 22 Details renamed from Twality Columbia 1854, Multnomah 1854
Wheeler 1899 Feb 17 Details Crook, Gilliam, Grant none
Yamhill 1843 Jul 05 Details Oregon Country Polk 1845, Tillamook 1853

References

  1. ↑ [http://historical-county.newberry.org/website/Oregon/viewer.htm Oregon Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
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