The following is a summary of acts which authorized boundary changes for Lewis County.
- Acts of 1855-56, Chapter 55, changed the lines between Lewis County and Hickman County so as to include the dwelling and lands belonging to Jesse G. Thompson wholly within Lewis County.
- Acts of 1859-60, Chapter 100, moved the residence and lands belonging to A. J. Pugh out of Lewis County and into Maury County.
- Acts of 1859-60, Chapter 210, detached the lands and homes of A. S. Strong, William Scott, and A. J. Pugh from Lewis County and attached them all to Maury County.
- Acts of 1871, Chapter 103, transferred all the lands belonging to Jesse M. Grinnell, located near the mouth of Indian Creek out of Hickman County and into Lewis County, provided such action did not reduce Hickman County below its Constitutional limits.
- Acts of 1889, Chapter 37, changed the lines between Lewis and Hickman County so that the lands of A. W. Weatherly were included wholly within Lewis County.
- Acts of 1889, Chapter 217, detached the lands and facilities of the Laurel Hill Manufacturing Company and the Napier Iron and Mining Company from Lawrence County and attached them to Lewis County.
- Acts of 1893, Chapter 7, rearranged the boundaries between Lewis County and Maury County so as to embrace in Maury County a tract of land known as the Barr Tract, owned by John Hildreth, containing 125 acres, more or less. The land was bounded on the north by George King, on the west by James F. Walker, on the south by J. G. Ingram, and on the east by the county line between the two counties.
- Private Acts of 1911, Chapter 21, moved all the lands belonging to R. G. Oglesby and C. B. Oglesby out of Perry County and into Lewis County.
- Private Acts of 1917, Chapter 763, amended the boundary lines heretofore established by Private Acts of 1885, Chapter 127, and by Private Acts of 1889, Chapter 217, between Lawrence County and Lewis County so as to more definitely locate the 146 acre tract known as the W. C. Napier lands. The description change began in the original south boundary line of Lewis County, thence ran south according to the degrees quoted in the Deed 128 poles east 17.5 poles south 34.5 poles west 237.5 poles north, 237.5 poles and east 120 poles to the beginning.
- Private Acts of 1929, Chapter 342, transferred certain real estate in the 5th Civil District of Lewis County belonging to Mora B. Fariss, containing 76.14 acres more or less, and generally described in the Act, out of Lewis County and into Maury County.