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Eugene Donald Millikin (February 12, 1891 – July 26, 1958) was a United States Senator from Colorado who served as Senate Republican Conference Chairperson from 1947 to 1956.

Eugene Millikin
Eugene Millikin.jpg
Republican Senate Conference Chairmen
In office
January 3, 1947 – January 3, 1957
LeaderWallace H. White, Jr.
Kenneth S. Wherry
Styles Bridges
Robert A. Taft
William F. Knowland
Vice ChairMilton Young
Preceded byArthur H. Vandenberg
Succeeded byLeverett Saltonstall
Chairman of the Senate Committee on Finance
In office
January 3, 1953 – January 3, 1955
Preceded byWalter F. George
Succeeded byHarry F. Byrd
In office
January 3, 1947 – January 3, 1949
Preceded byWalter F. George
Succeeded byWalter F. George
United States Senator
from Colorado
In office
December 20, 1941 – January 3, 1957
Preceded byAlva B. Adams
Succeeded byJohn A. Carroll
Personal details
Born(1891-02-12)February 12, 1891
Hamilton, Ohio
DiedJuly 26, 1958(1958-07-26) (aged 67)
Denver, Colorado
Political partyRepublican


Born in Hamilton, Ohio, Millikin graduated from the law school of the University of Colorado at Boulder in 1913. He was admitted to the bar the same year and commenced practice in Salt Lake City, Utah. He entered politics and served as executive secretary to the Governor from 1915 to 1917. During World War I he enlisted as a private in the Colorado National Guard in 1917, saw action in France and was mustered out as a lieutenant colonel. Millikin resumed the practice of law in Denver, Colorado, and became president of Kinney-Coastal Oil.

Millikin was appointed on December 20, 1941, and subsequently elected on November 3, 1942, as a Republican to the United States Senate to fill the vacancy in the term ending January 3, 1945, caused by the death of Alva B. Adams. He was reelected in 1944 and 1950, and served in all from December 20, 1941 to January 3, 1957. (He was not a candidate for renomination in 1956).

He served as chairman of the U.S. Senate Committee on Finance, the Senate Republican Conference, the U.S. Senate Joint Committee on Internal Revenue Taxation. Millikin died in Denver in 1958 and was interred in the Fairmount Mausoleum at Fairmount Cemetery in Denver.


  • United States Congress. "Eugene Millikin (id: M000771)". Biographical Directory of the United States Congress.

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U.S. Senate
Preceded by
Alva B. Adams
U.S. Senator (Class 3) from Colorado
Served alongside: Edwin C. Johnson, Gordon L. Allott
Succeeded by
John A. Carroll
Political offices
Preceded by
Walter F. George
Chairman of the Senate Finance Committee
Succeeded by
Walter F. George
Chairman of the Senate Finance Committee
Succeeded by
Harry F. Byrd
Party political offices
Preceded by
Arthur H. Vandenberg
Chairman of the Senate Republican Conference
Succeeded by
Leverett Saltonstall