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February 17, 1827 -
MERCER lost to creation of JO DAVIESS.
(Ill. Rev. Code 1826-1827, pp. 117-118)
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January 13, 1825 -
February 17, 1827
MERCER created from Non-County Area 3 attached to PIKE; MERCER was divided into two parts.
(Ill. Laws 1824-1825, pp. 85-87, 92-96)
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