|Best known for||Governor|
| Born||04/10/1847, Tuscarawas County, Ohio, USA|
| Military Service||Army, infantryman, during the Civil War.|
| Education||Ohio Wesleyan University received M.A. and LL.B. degrees (1873)|
| Marriages||Zephorena Edgerton 06/26/1878|
| Children||Howard Cosgrove, 1881. Elliot Cosgrove, 1883. Myrn Cosgrove, 1885. |
| Death||03/28/1909, Paso Robles, San Luis Obispo County, California, USA|
| Buried||Masonic Cemetery, Tumwater, Thurston County, Washington, USA|
- Teacher and Principal.
- Mayor. Pomeroy. Served for five terms.
- Governor. Republican. Washington. 1909 - 1909. Candidate for Republican nomination for governor in several state conventions when no candidate won a majority, the second choice candidates added and Cosgrove won the nomination. Won gubernatorial election in 1908. Served for only one day due to health complications, January 27, 1909, and died two months later. .