January 2, 1818 (Territorial
Laws, 1817–1818, p. 15)
Origin of the name of the county:
Named for the
federal union of the American States.
Present area, or parts of it, formerly included
in:
1812–1818
Johnson
1795–1812
Randolph
1790–1795
St. Clair
County Seat:
1818–
Jonesboro
History of county governing board:
1818–1819
Justices’ Court
1819–1849
County
Commissioners’ Court
1849–1873
County Court
1873–
Board of County
Commissioners
Township Government
Union county has
never adopted township form of government. The
county has been divided into precincts.
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