| Last Name | First Name | Birth Date | Death Date | Residence Location | SSN | Issued |
| DUNCAN | HELEN | Dec 23, 1900 | Jun, 1980 | Keosauqua, Iowa, 52565 | 483-38-5460 | |
| DUNCAN | KATHERINE R | Feb 18, 1923 | Aug 2, 1999 | Keosauqua, Iowa, 52565 | 484-14-9318 | |
| DUNCAN | MICHAEL K | Mar 19, 1950 | Dec 10, 1996 | Keosauqua, Iowa, 52565 | 415-84-7828 | |
| DUNCAN | RAY L | Feb 19, 1917 | Jul 10, 2005 | Keosauqua, Iowa, 52565 | 485-10-6467 |