| James O'DONNELL |
Colo |
| Martin O'DONNELL |
Colo |
| Patrick O'DONNELL |
Colo |
| Dennis O'LEARY |
Rhodes (Marshall Co) |
| John O'NEIL |
Zearing |
| Betsey OAKLAND |
Huxley |
| J J OAKLAND |
Huxley |
| S E OGDEN |
Nevada |
| Dennis OHASE |
Ontario |
| A J OLESON |
Roland |
| Abel OLESON |
Roland |
| B OLESON |
Gilbert Station |
| Isaac OLESON |
Roland |
| John OLESON |
Kelley |
| Kittle OLESON |
Story City |
| Nels OLESON |
Ontario |
| O L OLESON |
Gilbert Station |
| Ole D OLESON |
Roland |
| Ole D OLESON |
Story City |
| Ole J OLESON |
Roland |
| Ole R OLESON |
Huxley |
| Samuel OLESON |
Story City |
| Dobbe OLEVER aka OLIVER (Ed Guess) |
Slater |
| Thos OLEVERSON aka OLIVERSON (1895 Cen) |
Huxley |
| J M OLINGER |
Maxwell |
| A A OLSON |
Roland |
| A K OLSON |
Huxley |
| Abel OLSON |
Roland |
| B B OLSON |
Slater |
| C OLSON |
Roland |
| Christian OLSON |
Story City |
| Forger OLSON |
Slater |
| G T OLSON |
Slater |
| Hans OLSON |
Roland |
| J OLSON |
Roland |
| Jacob OLSON |
Story City |
| John OLSON |
Roland |
| K OLSON |
Roland |
| Kittle OLSON |
Story City |
| L R OLSON |
Huxley |
| Lars OLSON |
Story City |
| M OLSON |
Roland |
| Ole G OLSON |
Gilbert Station |
| Ole M OLSON |
Story City |
| Ole O OLSON |
Slater |
| Thos OLSON |
Huxley |
| Thos Jr OLSON |
Huxley |
| H OPSTVEDT |
Roland |
| Sven OPSTVEDT |
Roland |
| Lewis OSBORN |
Ames |
| T OSBORN |
Ames |
| O O OSE |
Zearing |
| T OSMUNDSON |
Roland |
| Nels OSMUNSON |
Roland |
| John OSWALD |
Story City |
| Edward OSWALT |
Collins |
| John OXLEY |
Maxwell |
| W R OXLEY |
Maxwell |
| Ann OZMUN |
Collins |
| L D OZMUN |
Collins |
| Orcela T OZMUN |
Collins |
| S G OZMUN |
Collins |
| W H OZMUN |
Collins |