The following is a summary of acts which authorized boundary changes for Macon County.
- Acts of 1843-44, Chapter 61, stated that the boundary line between Smith and Macon Counties, as described in the first section of the act which created Macon County (Acts of 1841-42, Chapter 45) is hereby established and declared to be the permanent line between the two counties.
- Acts of 1853-54, Chapter 181, Section 6, changed the boundary lines between Macon and Sumner Counties so as to include the dwelling and the lands of George H. Carter wholly within Sumner County.
- Acts of 1865-66, Chapter 104, removed the house and lands belonging to Andrew Conn out of Jackson County and into Macon County.
- Acts of 1866-67, Chapter 23, amended Chapter 104, Acts of 1865-66, above, so as to correct the name of the person whose property was moved from Andrew Conn to Andrew Comer.
- Acts of 1889, Chapter 118, arranged for the lands belonging to Green Williams, which lie partly in Sumner, Trousdale, and Macon counties, to be transferred wholly into Trousdale County. The Surveyor of Trousdale County would run and mark the said boundary lines so as to establish the boundary lines of all three counties at this point and in accordance with this act.
- Private Acts of 1901, Chapter 282, so changed the boundary lines between Macon and Clay counties that the lands of Sam H. Hance which were situated in Clay County were moved over to be wholly in Macon County.
- Private Acts of 1901, Chapter 305, moved all the lands belonging to G.W. Goad out of Macon County and into Smith County.
- Private Acts of 1903, Chapter 226, detached all the lands belonging to Jerry Agee and Malangthon Kirby, from Clay County and attached the same to Macon County.
- Private Acts of 1905, Chapter 196, contained a general description of the land area containing the residences, and properties, of J. Y. Williams, J. M. Henson, W. M. Henson, J. B. Garrett, W. R. Duffy, George Vance, Jim Woodard, and John Hawkins, and the Widow Taylor, which was transferred out of Macon County and into Sumner County.
- Private Acts of 1919, Chapter 787, rearranged the boundary lines between Macon and Trousdale Counties so as to include wholly within Trousdale County the lands and improvements of Albert Creasy, Jeff Carr, Henry Hall, William Cook, J. W. Thompson, E. T. Story, and John Seath.
- Private Acts of 1927, Chapter 718, moved the jointly owned lands of I. B. Thomas and W. E. Taylor out of the Seventh Civil District of Macon County and into the Sixth Civil District of Smith County.
- Private Acts of 1955, Chapter 55, states that no action had been taken on this act by the Quarterly County Court of Macon County at the time the printed volume of Private Acts was published. The act states by way of a preamble that Henry Sloan and Carnie Gammons own farms on the Macon - Smith County line. Henry Sloan desires to transfer five acres from Macon County into Smith County and twenty-nine acres from Smith County into Macon County; that Carnie Gammons desires to move eleven acres from Smith County into Macon County, and this act accomplishes the desired transfers, describing the involved properties in a general fashion.