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October 23, 1999 -
COOS gained small area from DOUGLAS when boundary redefined to run along range line. COOS boundary with CURRY redefined [no change].
(Ore. Laws 1999 70th reg. sess. ch. 600/pp. 1396-1399)
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October 14, 1983 -
October 23, 1999
COOS lost very small area in T 28 South/ R 9 West / Sec. 36 to DOUGLAS. COOS boundary with CURRY redefined [no change].
(Ore. Laws 1983 62nd reg. sess. ch. 778/pp. 1514-1515)
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April 30, 1951 -
October 14, 1983
COOS exchanged with CURRY when boundary redefined to run along township and range lines instead of ridge lines.
(Ore. Laws 1951 46th reg. sess. ch. 422/pp. 684-687)
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October 16, 1882 -
April 30, 1951
COOS exchanged with DOUGLAS.
(Ore. Special Laws 1882 12th reg. sess. pp. 83-84)
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October 19, 1878 -
October 16, 1882
COOS gained from DOUGLAS.
(Ore. Special Laws 1878 10th reg. sess. pp. 162-164)
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October 28, 1872 -
October 19, 1878
COOS gained from CURRY.
(Ore. Laws 1872 7th reg. sess. pp. 183-184)
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October 21, 1864 -
October 28, 1872
COOS exchanged with DOUGLAS.
(Ore. Laws 1864 3rd reg. sess. p. 44)
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July 06, 1863 -
October 21, 1864
COOS exchanged with DOUGLAS.
(Ore. Laws 1862 2nd reg. sess. p. 59)
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February 14, 1859 -
July 06, 1863
Inherited from Oregon Territory
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