| Birth | about 1909 | Howard Sinclair was born about 1909 in Kentucky. |
| Marriage | | He and Helen Valentine Harris, daughter of Noah Lee Harris and Agnes Miriam Lake, were married. |
| 1940 Census | 24 Apr 1940 | Howard Sinclair appeared as head of household in the 1940 Federal Census of Indianapolis, Marion County, Indiana, as Howard S. Sinclair. Living with him was his wife, Helen, as well as his father-in-law, Noah Lee Harris, and his sister-in-law, an unknown or excluded person. |
| Death | 1968 | Howard Sinclair died in 1968. |
| Burial | 5 Oct 1968 | He was buried on 5 Oct 1968 in Crown Hill Cemetery, located in Indianapolis, Marion County, Indiana, in Sec: 224, Lot: 692. |
Howard Sinclair