These lists have been broken down by the major series. In cases where a correspondent frequently appeared in some months or years, exact dates have not been given.

Series 1: Personal Correspondence and Papers

• Styles Bridges, 1959 November 12
• Wayne Hood, 1958 October-November, 1959 October-November
• Victor Johnston, 1954 November, 1959 October
• James Scott Kemper, 1954 October, 1964 February 19
• Warren P. Knowles, 1957 April 26
• W.H. “Bill” Lawrence, 1963 May 22
• I. Jack Martin, 1953 March-June
• John F. “Jack” Mills, 1963 May-June
• Jack Rouse, 1953 June 19, 1963 May 20
• Arthur E. Summerfield, 1962 March 15, 1963 September 25
• Chester O. Wanvig Jr., 1959 April 1
• Wendell Willkie, 1943 December 28

Series 2: Political Correspondence and Papers

• Joseph W. Alsop, 1954 February-March, regarding a misrepresentation of Coleman's position printed in the Alsop column. See also letters from prominent Republicans concerning this matter.
• Ray C. Bliss, 1950 March 8, 1954 March 8
• Owen Brewster, 1949-1950 Styles Bridges, 1956 July
• Styles Bridges, 1956 July
• John W. Byrnes, 1949 June-July; 1953 April 1; 1954, 1963 June, August
• Glenn Davis, 1953 October 23; 1955 April, 1956, 1961 October 9; 1962 January 2, December 5
• Cecil B. de Mille, 1952 October 16
• Dwight D. Eisenhower, 1953 June 5
• William T. Evjue, 1950 June, regarding Madison Capital Times libel suit
• Leslie H. Fishel Jr., 1960 July 20, regarding the history of the 1960 Republican National Convention
• Barry Goldwater, 1959 January 23
• Walter S. Goodland, 1946 April, June 5
• Harvey V. Higley, 1959-1960, regarding movement to nominate Richard M. Nixon as the Republican Presidential candidate
• Wayne Hood, 1951-1956, 1958-1963
• Victor Johnston, 1946 March 28; 1959 January 19; 1962 April 12; 1963 April, September 16
• James Scott Kemper, 1944-1956, 1960 June-November
• Charles J. Kersten to Richard M. Nixon, 1952 October 23, regarding campaign tactics
• Warren P. Knowles, 1959 April 23, 1963 September
• Philip G. “Buz” Kuehn, 1959 April-May, September, 1961 June, October-November
• Melvin Laird, 1956 May 31, 1956 June-July, 1961 August 25, December 27
• W.H. “Bill” Lawrence, 1954 January, 1956 June 1, 1959 November 30, December 2
• Clarence Manion, 1959 June-July, regarding movement to nominate Barry Goldwater as the Republican Presidential candidate
• John F. “Jack” Mills, 1961-1962
• Richard M. Nixon, 1960 October
• Ronald Reagan, 1962 May 28
• T.J. Reardon, 1955 January 28 regarding Senator John F. Kennedy's nomination of Senator Robert A. Taft for Man of the Year in 1955
• Henry Ringling, 1948-1949, 1953 October 23., 1954 March 10
• Hugh D. Scott Jr., 1949-1952
• Harold E. Stassen, 1947 December, 1948 June
• Arthur E. Summerfield, 1948-1962
• Robert A. Taft, 1949 June 28
• Robert A. Taft Jr., 1963 September 30, October-December
• Harold Talbot, 1951 January 18, June 19, 1954 March 12
• Chester O. Wanvig Jr., 1950-1951, 1954, 1958 May
• Alexander Wiley, 1949 July 6
• John Wyngaard, 1955 September, 1956 January

Series 3: Senator Robert A. Taft Campaign of 1952

• Styles Bridges, 1952 June 21
• Homer E. Capehart, 1952 June 21
• Cecil B. de Mille, 1952 July 28
• Thomas E. Dewey to Dewitt T. Van Alen, 1952 July 10
• Everett McKinley Dirksen, 1952 July 29
• Dwight D. Eisenhower, 1952 August 8
• L. Richard Guylay, 1951 October November
• John D. M. Hamilton, throughout the correspondence
• Harvey V. Higley, throughout the correspondence
• David S. Ingalls, throughout the correspondence
• William E. Jenner, 1952 June 16
• Victor Johnston, throughout the correspondence
• James Scott Kemper, 1952 June
• Warren P. Knowles, 1952 July 16
• W.H. “Bill” Lawrence, 1954 August 16
• Henry Cabot Lodge, 1952 June 25, July 1
• Joe McCarthy, 1952 June 20
• I. Jack Martin, throughout the correspondence
• John F. “Jack” Mills, throughout the correspondence
• John G. Pegg, 1952 June 25, Memo “Report on Colored Delegates”
• Jack Rouse, 1952 January-June
• Harold E. Stassen, 1952 August 11
• Arthur E. Summerfield, 1951 December 10
• Robert A. Taft, throughout the correspondence
• Benjamin E. Tate, throughout the correspondence
• A.C. Wedemeyer, 1952 June-July

Series 4: Robert A. Taft Memorial Foundation

• Sherman Adams, 1956 April 13
• Ezra Taft Benson, 1955 October 18, 1959 February 5
• John W. Bricker, 1955 October 4
• Styles Bridges, 1955 December 12
• Clarence J. Brown, throughout the correspondence
• Katherine Kennedy Brown, throughout the correspondence
• Walther Buchen, 1955 August 11, September 2, November 28, December 7, 1956 July 27-31
• John M. Christie, throughout the correspondence
• May Preston Davie, throughout the correspondence, see especially 1960 May 31
• Everett McKinley Dirksen, 1955 December 8, 1956 January 17
• Robert V. Fleming, throughout the correspondence
• Barry Goldwater, 1956 January 13, 1957 December 2
• L. Richard Guylay, throughout the correspondence
• Herbert Hoover, 1955 October 28
• George Humphrey, 1955 October 17
• David S. Ingalls, throughout the correspondence
• Pauline Isaacson, 1954 October 26-1955 March 3; 1956 February 21-27; 1958 December 29-1959 March 23; 1959 August 3-September 18, November 13, December 31-1960 February 18; 1960 May 17-20 regarding Taft biography
• William E. Jenner, 1956 January 13
• Philip G. Kuehn, 1955 September 16; 1958 May 20
• Melvin Laird, 1956 January 16
• I. Jack Martin, throughout the correspondence
• Joseph W. Martin, 1956 February 13, to Lewis B. Perkins
• John F. “Jack” Mills, throughout the correspondence
• B. Carroll Reece, throughout the correspondence, especially from Thomas E. Coleman, 1960 May 26
• Lawrence E. Spivak, 1955 August 11-22, 1956 January 6
• Lewis L. Strauss, 1955 November 8
• Arthur E. Summerfield, 1956, May 28, 1958, July 31
• Robert A. Taft Jr., 1955 August 10-December; 1956 May 14; 1957 February 14-20; 1958 May 27-29
• Ben E. Tate, throughout the correspondence
• A.C. Wedemeyer, 1955 December 12