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February 28, 1843 -
McLEAN exchanged with WOODFORD.
(Ill. Laws 1842-1843, p. 91)
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February 27, 1841 -
February 28, 1843
McLEAN lost to creation of WOODFORD.
(Ill. Laws 1840-1841, pp. 84-86)
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March 01, 1839 -
February 27, 1841
McLEAN lost to creation of DE WITT.
(Ill. Laws 1838-1839, pp. 199-201)
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February 27, 1837 -
March 01, 1839
McLEAN lost to creation of LIVINGSTON.
(Ill. Laws 1836-1837, pp. 83-85)
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December 25, 1830 -
February 27, 1837
McLEAN created from TAZEWELL and Non-County Area 6 attached to TAZEWELL.
(Ill. Laws 1830-1831, pp. 57-59)
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