| Birth | 19 Nov 1857 | DeSoto, Jackson Co., IL | | | |
| Marriage | 13 Sep 1876 | Jackson Co., IL - William P. DUNCAN | |  | |
| Census | 1 Jun 1880 | DeSoto, Jackson Co., IL, ED 39 pg. 8D; Maria Duncan, 23 (1856-57), born IL father born IL mother born KY, cannot read or write. | | | |
| Census | 1 Jun 1900 | Malden, Cotton Hill Twp., Dunklin Co., MO, ED 43 Sh 3A; Mariah E. Duncan, wife, born Nov 1857, 42, married 24 yr., mother of 5, 3 living, born IL father born TN mother born KY. | | | |
| Census | 15 Apr 1910 | North Malden, Cotton Hill Twp., Dunklin Co., MO, ED 64 Sh 12B; Maria E. Duncan, wife, 52 (1857-58), marriage 1 of 33 yr., mother of 5, 3 living, born IL father born KY mother born IL, keeper - boarding house. | | | |
| Census | 1 Jan 1920 | Independent City of St. Louis, Ward 28, MO, ED 571 Sh 2A; Mary E. Duncan, wife, 62 (1857), born IL father born TN mother born KY. | | | |
| Census | 1 Apr 1930 | Independent City of St. Louis, Ward 28, MO, ED 253 Sh 19A; Maria E. Duncan, head, widow, 72 (1857-58), born IL father born IL mother bonr KY. | | | |
| Death | 15 Oct 1931 | St. Louis City, Missouri | |  | |
| Burial | 17 Oct 1931 | DeSoto, Jackson Co., IL | | | |
| Reference No | | 7262 | | | |