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February 22, 1893 -
TILLAMOOK exchanged with WASHINGTON.
(Ore. Laws 1893 17th reg. sess. pp. 161-162)
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February 20, 1893 -
February 22, 1893
TILLAMOOK lost to creation of LINCOLN lost to CLATSOP.
(Ore. Laws 1893 gen. 17th reg. sess. pp. 68-77; pp. 77-78)
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February 21, 1891 -
February 20, 1893
TILLAMOOK exchanged with POLK.
(Ore. Laws 1891 gen. 16th reg. sess. pp. 139-140)
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February 20, 1891 -
February 21, 1891
TILLAMOOK gained from CLATSOP.
(Ore. Laws 1891 gen. 16th reg. sess. pp. 102-103)
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February 15, 1887 -
February 20, 1891
TILLAMOOK exchanged with YAMHILL.
(Ore. Laws 1887 gen. 14th reg. sess. p. 147)
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October 22, 1870 -
February 15, 1887
TILLAMOOK gained from CLATSOP.
(Ore. Laws 1870 6th reg. sess. pp. 24-25)
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February 14, 1859 -
October 22, 1870
Inherited from Oregon Territory
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