| 1840 FERGUSON Index | ||||
| Last | First | Census | Location | Census |
| Name | Name | State | (County; Town) | Year |
| Ferguson | Robert | MD | Allegany; Selbysport | 1840 |
| Furgerson | Diner | MD | Anne Arundel; Division 2 | 1840 |
| Ferguson | William | MD | Anne Arundel; Division 3 | 1840 |
| Fergeson | John | MD | Baltimore; Baltimore Ward 11 | 1840 |
| Ferguson | Benjm | MD | Baltimore; Baltimore Ward 12 | 1840 |
| Ferguson | Saml | MD | Baltimore; Baltimore Ward 12 | 1840 |
| Ferguson | Alexander | MD | Baltimore; Baltimore Ward 4 | 1840 |
| Furgeson | James | MD | Baltimore; Baltimore Ward 4 | 1840 |
| Ferguson | Samuel | MD | Baltimore; Baltimore Ward 5 | 1840 |
| Ferguson | Thos | MD | Baltimore; Baltimore Ward 7 | 1840 |
| Ferguson | Benj | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Ferguson | Duncan | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Ferguson | Geo | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Ferguson | Margaret | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Ferguson | Maria | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Ferguson | Saml J | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Ferguson | Wm | MD | Baltimore; Baltimore Ward 8 | 1840 |
| Fergusson | Jas | MD | Baltimore; Baltimore Ward 9 | 1840 |
| Furgurson | John | MD | Baltimore; District 2 | 1840 |
| Ferguson | Levi | MD | Baltimore; District 2 | 1840 |
| Ferguson | John | MD | Carroll; District 2 | 1840 |
| Ferguson | John M | MD | Cecil; District 2 | 1840 |
| Ferguson | Saml | MD | Cecil; District 2 | 1840 |
| Furgeson | James | MD | Cecil; District 3 | 1840 |
| Furgason | William | MD | Cecil; District 3 | 1840 |
| Ferguson | David | MD | Cecil; District 4 | 1840 |
| Ferguson | George | MD | Cecil; District 4 | 1840 |
| Ferguson | James M | MD | Cecil; District 4 | 1840 |
| Ferguson | John | MD | Cecil; District 4 | 1840 |
| Ferguson | Robert | MD | Cecil; District 4 | 1840 |
| Ferguson | Wm | MD | Cecil; District 4 | 1840 |
| Fergusson | John | MD | Charles; District 2 | 1840 |
| Fergusson | Wm | MD | Charles; District 2 | 1840 |
| Fergusson | John R | MD | Charles; District 4 | 1840 |
| Furguson | Mary | MD | Charles; no twp listed | 1840 |
| Ferguson | Catharine | MD | Dorchester; Frederick | 1840 |
| Furguson | Richard | MD | Dorchester; Parsons Creek | 1840 |
| Forgason | Peggy | MD | Frederick; District 11 | 1840 |
| Ferguson | Eli | MD | Frederick; District 5 | 1840 |
| Ferguson | James | MD | Frederick; District 5 | 1840 |
| Ferguson | William | MD | Frederick; District 5 | 1840 |
| Furguson | David | MD | Harford; District 5 | 1840 |
| Furguson | John | MD | Harford; District 5 | 1840 |
| Furguson | Colin | MD | Kent; District 2 | 1840 |
| Furgurson | Henry | MD | Queen Anne's; Centreville | 1840 |
| Furgeson | William | MD | Queen Anne's; Centreville | 1840 |
| Furguson | William | MD | Talbot; District 4 | 1840 |