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County Detail
Mercer County
County Seat:
Aledo
Previous Seats:
New Boston, 1835; Millersburg, 1836; Keithsburg, 1847; Aledo, 1857
Area:
556 square miles
Population:
26 (1830 census) - 16,434 (2010 census)
Named for:
Hugh Mercer, Revolutionary War General
Created on:
January 13, 1825
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