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Established: |
January 13, 1825 (Laws, 1825, p. 93) |
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County organization was completed in 1835. |
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Origin of the name
of the county: |
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Named for Hugh Mercer, a General of the
Revolution, killed at the battle of Princeton. |
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Present area, or
parts of it, formerly included in: |
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1831–1835 |
Attached to Warren (Laws, 1831, p. 68.) |
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1826–1831 |
Attached to Peoria (Laws, 1826, p. 76.) |
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1825–1826 |
Attached to Schuyler (Laws, 1825, p. 95.) |
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1821–1825 |
Pike |
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1812–1821 |
Madison |
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1795–1812 |
St. Clair |
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County Seats: |
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1835–1837 |
New Boston—Temporary designation. |
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1837–1847 |
Millersburg |
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1847–1857 |
Keithsburg |
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1857– |
Aledo |
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History of county
governing board: |
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1835–1849 |
County Commissioners’ Court |
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1849–1854 |
County Court |
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1854– |
County Board of Supervisors |
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| Township
Government |
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Adopted: |
November 8, 1853 |
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Township Names: |
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Abington |
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Duncan |
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Eliza |
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Greene |
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Keithsburg |
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Mercer |
Name changed from Centre (date unknown, before 1921). |
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Millersburg |
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New Boston |
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North Henderson |
Name changed from Liberty (date unknown, before 1921). |
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Ohio Grove |
Name changed from Ohio (date unknown, after 1921). |
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Perryton |
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Preemption |
Name changed from Fairfield (date unknown, before 1921). |
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Richland Grove |
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Rivoli |
Name changed from North Pope (date unknown, before 1921). |
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Suez |
Name changed from Palmyra (date unknown, before 1921). |
