On the 29th of January, 1821, an act was passed declaring "That the line formerly run by Solomon McCulloch, as the eastern boundary line of Champaign county, be, and the same is, hereby, declared the eastern boundary of said county. That so much of said line as lies north of a point six miles north of the southeast corner of the county of Champaign be, and the same is, hereby, declared the eastern boundary of the county of Clark. That the line between the counties of Madison and Union shall be run parallel with the line formerly run as the dividing line between the counties of Madison and Franklin, and the county of Delaware." On February 4, 1825, William Wilson, of Clark county, was appointed to run a line between the counties of Madison and Union, viz.: "To commence at the southeast corner of the county of Union, and run from thence a due west course to the eastern boundary of Champaign county." He was instructed to leave a duplicate of said survey, also the plats and notes thereof, with the commissioners of each county, "which line so surveyed, platted and returned, shall be, and remain the established line between the counties of Union and Madison."
On January 22, 1827, an act was passed to alter and establish the line between the counties of Clark and Madison: "Beginning at the northeast corner of Clark county, and to run from thence to a point so far east of the southeast corner of the said county of Clark as will leave as much land or territory, in the said county of Clark, as shall be taken by the county of Madison, or in other words, the said line shall be so run as to include in and exclude from the said counties respectively an equal quantity of territory." By the second section of this act, the surveyor of Madison county was authorized and required to run, and have said line plainly marked, agreeably to the provisions of the first section of the act; to have the same completed by March 20, 1827, and to make a return of said survey to the clerks of the court of common pleas of both counties, Madison county to defray the full expense of running and marking said line.
Under an act passed on January 29, 1827, a new line was ordered to be run between Union and Madison counties, to wit: "That Jeremiah McLene, of the county of Franklin, be, and hereby is appointed to run, survey, mark and establish a line between the counties of Madison and Union, to commence at the southeast corner of the county of Union, and running from thence a direct line to a point in the line of the eastern boundary of the county of Champaign, two and a half miles south of the line formerly run between the counties of Delaware and Madison; which line so run, surveyed, platted and returned, shall be and remain the established line between the aforesaid counties of Madison and Union." Each county was to bear half the expense of said survey, which was to be completed before April 1, 1827; and all laws or parts of laws passed previously to such act and inconsistent with the same were declared repealed. It was enacted on January 5, 1828: "That the line run as the line between the counties of Madison and Union, by Levi Phelps, in the year 1820, be, and the same is hereby declared to be the established line between the aforesaid counties."
There has only been one change made in the lines of Madison county since the above date. By an act passed on the 4th of March, 1846, the line betwem Madison and Franklin counties was changed by making Big Darby creek the boundary from the southeast corner of survey No. 2677, in Jefferson township, to the southeast corner of survey No. 3313, in Canaan township, and thus the lines have since remained.