Papers of the New York State lawyer, U.S. Congressman (1859-1863), abolitionist, born near Pompey, N.Y. Correspondence (1847-1891); genealogical material; legal and financial records (1814-1879); writings (1837-1884), including essays, speeches, and published letters; and memorabilia. Largely family correspondence with additional letters of Louis Agassiz, Samuel Bowles, Salmon P. Chase, F.J. Child, James Freeman Clarke, Roscoe Conkling, George W. Curtis, John A. Dahlgren, Richard H. Dana, H.L. Dawes, Daniel S. Dickinson, J.T. Fields, John M. Forbes, John C. Frémont, William Lloyd Garrison, George W. Geddes, George F. Hoar, John Jay, Thomas Starr King, Samuel J. May, Robert B. Minturn, Levi P. Morton, Charles Eliot Norton, Elizabeth P. Peabody, Wendell Phillips, William H. Seward, Gerrit Smith, Israel Washburn, R.S. Watson, Andrew D. White, and others.

New York State Governor, 1885-1891; U.S. Senator, 1891-1897. Collection contains incoming and outgoing correspondence (chiefly political), legal papers and memorabilia.

Papers of the Utica attorney, U.S. Senator. Outgoing correspondence primarily of a political nature, which reflects Conkling's interest in Republican Party politics at the State and national levels. Includes letters to Thomas Alvord, Henry J. Cookinham, James M. Dalzell, and Edward Ingersoll.