Leonard Livingstone Cosner
- Born: 10 September 1897, Bismarck, Grant, West Virginia, United States
- Marriage (1): Ethel Blanche Cosner on 12 April 1922 in Garrett, Maryland, United States
- Died: 29 April 1977, Bismarck, Grant, West Virginia, United States at age 79
Leonard married Ethel Blanche Cosner, daughter of Edward Jacob Cosner and Ruhuma Catherine Rinker, on 12 April 1922 in Garrett, Maryland, United States. (Ethel Blanche Cosner was born on 1 August 1905 in Gormania, Grant, West Virginia, United States and died on 3 July 1978 in Bismarck, Grant, West Virginia, United States.)
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