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April 15, 1828 -
ONTARIO lost to SENECA.
(N.Y. Rev. Stat., 3:14-15)
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April 11, 1823 -
April 15, 1828
ONTARIO lost to creation of WAYNE.
(N.Y. Laws 1823, 46th sess., ch. 138, sec. 1/p. 158)
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February 05, 1823 -
April 11, 1823
ONTARIO lost to creation of YATES.
(N.Y. Laws 1823, 46th sess., ch. 30, sec. 1/p. 21)
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February 23, 1821 -
February 05, 1823
ONTARIO lost to creation of LIVINGSTON and MONROE.
(N.Y. Laws 1820, 44th sess., ch. 57, sec. 1/p. 46; ch. 58, sec. 1/p. 50)
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February 25, 1814 -
February 23, 1821
ONTARIO gained from STEUBEN.
(N.Y. Laws 1814, 37th sess., ch. 24/p. 27)
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March 24, 1804 -
February 25, 1814
ONTARIO gained from CAYUGA.
(N.Y. Laws 1804, 27th sess., ch. 31/p. 112)
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March 30, 1802 -
March 24, 1804
ONTARIO lost to creation of GENESEE.
(N.Y. Laws 1802, 25th sess., ch. 64/p. 97)
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April 03, 1801 -
March 30, 1802
ONTARIO exchanged with CAYUGA.
(N.Y. Laws 1801, 24th sess., ch. 123/p. 290)
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March 18, 1796 -
April 03, 1801
ONTARIO lost to creation of STEUBEN.
(N.Y. Laws 1796, 19th sess., ch. 29/p. 667)
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January 27, 1789 -
March 18, 1796
ONTARIO created from MONTGOMERY.
(N.Y. Laws 1789, 12th sess., ch. 11/p. 10)
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