The collection includes more than 240 pieces of George Colin McKee's correspondence, virtually all of it directed to McKee. The correspondence spans the period 1864 to 1883; at least 77 of the letters (and telegrams) date from 1877-78, shortly after McKee left the House of Representatives. Among the many letters whose content is primarily personal or business-related are many others from individuals active in public life, which reference the politics of Reconstruction-era Mississippi and the greater nation. Most are written by Republican colleagues, including Joshua S. Morris, James Lynch, Eugene P. Jacobson, Edward J. Castello, Henry R. Pease, John L. Morphis, Albert T. Morgan, James J. Hill, and Ridgley C. Powers. Party figures of true national prominence are for the most part absent. There are also a good many patronage letters. Also present are some 80 manuscript pages of speeches, speech drafts, and speech notes, in McKee's hand. Perhaps the most significant is a 15-page speech delivered by McKee at the 1868 Mississippi constitutional convention. There are also numerous speech notes that appear to date from the period of the 1872 elections (when McKee received the Republican nomination for the Vicksburg Congressional district over Secretary of State James Lynch). Among the 90-odd legal and financial papers of McKee's are several affidavits (1876-77) testifying to the persecution of Madison County Republicans, white and black, by Democratic "night riders". Also in the collection is an accumulation of printed ephemera and clippings, some of it political in nature; a group of (mostly unidentified) photographs; and assorted papers of McKee family members, especially Anita Hortense McKee, George's wife, and Hortense McKee Gaither, George's daughter.

Includes one letter written by McKee to his wife, 23-26 November 1874.

Included is a letter written by McKee, to "My old Comrade" (17 October 1876).