[3] Ross later served in Captain Constant's Company, Colonel Neale's Detachment, of the Illinois Mounted Riflemen in the Winnebago Indian Disturbances of 1827.

[5] Ossian Ross, his family, and his companions settled in an area that is now known as Lewistown, Illinois, a town which he founded and named after his oldest son, Lewis.

[2] Ossian Ross donated a quarter-section of his land to the town for the establishment of a public square, courthouse, jail, church, and Masonic temple.

[6] Ossian and Mary Ross had three additional children in Illinois: Lucinda Caroline (1821–1900), who married William Kellogg); Leonard Fulton (1822–1901); and Pike Clinton (1825–1890).

[2] During the great debate over the slavery question in Illinois in 1824, Ossian Ross, together with Methodist minister Peter Cartwright, successfully championed the anti-slavery cause in Fulton county.

[13] After Ross left Lewistown, his homestead there was purchased by Major Isaac Newton Walker, a member of the Illinois State Legislature and a close friend of Abraham Lincoln.

The final pages of Ossian Ross' business ledger consist of a list of items that were purchased from the personal property of his estate by his son Lewis, totaling $3,392.24.

Robert B. Chiperfield, a great-grandson of Ossian and Mary Ross, was a United States representative from Illinois who served as chair of the House Committee on Foreign Affairs.