| 1840 FERGUSON Index | ||||
| Last | First | Census | Location | Census |
| Name | Name | State | (County; Town) | Year |
| Forgison | Henry | DE | Kent; Dover Hundred | 1840 |
| Furgason | Bassett | DE | New Castle; Appoquinamink Hundred | 1840 |
| Furgason | Charles | DE | New Castle; Mill Creek Hundred | 1840 |
| Furguson | John | DE | New Castle; Mill Creek Hundred | 1840 |
| Furguson | Joseph | DE | New Castle; Mill Creek Hundred | 1840 |
| Furguson | Robert | DE | New Castle; Mill Creek Hundred | 1840 |
| Ferguson | Robert | DE | New Castle; White Clay Creek | 1840 |
| Ferguson | James | DE | New Castle; Wilmington | 1840 |