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May 01, 1816 -
NORTHUMBERLAND lost to COLUMBIA.
(Pa. Laws 1815-1816, ch. 9, sec. 1/pp. 6-7)
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May 01, 1815 -
May 01, 1816
NORTHUMBERLAND gained from COLUMBIA.
(Pa. Laws 1814-1815, ch. 30, sec. 1/p. 38)
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November 01, 1813 -
May 01, 1815
NORTHUMBERLAND lost to creation of UNION.
(Pa. Laws 1812-1813, ch. 110, secs. 1-2/p. 150)
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September 06, 1813 -
November 01, 1813
NORTHUMBERLAND lost to creation of COLUMBIA.
(Pa. Laws 1812-1813, ch. 109, secs. 1-2/p. 146)
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March 20, 1812 -
September 06, 1813
NORTHUMBERLAND lost to MIFFLIN.
(Pa. Laws 1811-1812, ch. 96, sec. 1/p. 141)
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March 28, 1808 -
March 20, 1812
NORTHUMBERLAND lost to LUZERNE.
(Pa. Stat., ch. 2988, sec. 1/18:887)
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February 13, 1800 -
March 28, 1808
NORTHUMBERLAND lost to creation of CENTRE.
(Pa. Stat., ch. 2103, sec. 1/16:403)
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April 13, 1795 -
February 13, 1800
NORTHUMBERLAND lost to creation of LYCOMING.
(Pa. Stat., ch. 1834, sec. 1/15:288)
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September 19, 1789 -
April 13, 1795
NORTHUMBERLAND lost to creation of MIFFLIN.
(Pa. Stat., ch. 1436, sec. 1/13:321-322)
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September 24, 1788 -
September 19, 1789
NORTHUMBERLAND lost to creation of ALLEGHENY.
(Pa. Stat., ch. 1359, sec. 1/13:84-85)
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September 25, 1786 -
September 24, 1788
NORTHUMBERLAND lost to creation of LUZERNE.
(Pa. Stat., ch. 1244, sec. 1/12:300-301)
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April 08, 1785 -
September 25, 1786
NORTHUMBERLAND gained from Non-County Area 1. Non-County Area 1 eliminated.
(Pa. Stat., ch. 1164, sec. 15/11:595)
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September 30, 1779 -
April 08, 1785
NORTHUMBERLAND lost to BEDFORD.
(Pa. Stat., ch. 848, sec. 1/9:396-398)
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March 21, 1772 -
September 30, 1779
NORTHUMBERLAND created from BEDFORD, BERKS, CUMBERLAND, LANCASTER, NORTHAMPTON, and Non-County Area 1.
(Pa. Stat., ch. 644, sec. 1/8:143-144)
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