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February 21, 1903 -
WASHINGTON gained from COLUMBIA.
(Ore. Laws 1903 22nd reg. sess. pp. 151-152)
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February 25, 1901 -
February 21, 1903
WASHINGTON lost to COLUMBIA.
(Ore. Laws 1901 21st reg. sess. pp. 126-127)
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October 15, 1898 -
February 25, 1901
WASHINGTON gained from COLUMBIA.
(Ore. Laws 1898 20th spec. sess. pp. 27-28)
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February 22, 1893 -
October 14, 1898
WASHINGTON exchanged with CLACKAMAS TILLAMOOK and YAMHILL.
(Ore. Laws 1893 17th reg. sess. pp. 161-162)
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February 24, 1885 -
February 22, 1893
WASHINGTON exchanged with COLUMBIA.
(Ore. Special Laws 1885 13th reg. sess. p. 324)
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October 17, 1862 -
February 24, 1885
WASHINGTON lost to CLACKAMAS.
(Ore. Laws 1862 2nd reg. sess. p. 98)
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February 14, 1859 -
October 17, 1862
Inherited from Oregon Territory
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