1826 Illinois County Formation Map
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1826--VERMILION AND McDONOUGH
As counties of the State of Illinois
VERMILION. Jan. 18--West from the Indiana state line on the line between towns sixteen and seventeen north, to the line between ranges nine and ten east; thence north to the line between towns twenty-two and twenty-three north; thence east to the Indiana state line; thence south to the place of beginning.
[Laws 1826, p. 50.]
McDONOUGH. Jan. 25--West from the fourth principal meridian on the line between towns seven and eight north, to the line between ranges four and five west; thence south to the line between towns three and four north; thence east to the fourth principal meridian; thence north to the place of beginning.
[Laws 1826, p. 76.]