Index of Last Names Beginning with O
| LAST NAME | FIRST NAME | MIDDLE | MAIDEN NAME |
| Oger | Janet | M | Morrow |
| Oger | John | ||
| Oger | John | W | |
| Oger | Lizzie | Ringen | |
| Oger | Olive | ||
| Oldenburg | Albert | C | |
| Oldenburg | Mathilda | Grott | |
| Olsen | Anna | Katherine | Unknown |
| Olsen | Berta | Odsdotter | |
| Olsen | Gina | Johanna | Awes |
| Olsen | Gurina | Olinda | Hustoft |
| Olsen | Gurine | Ovidia | |
| Olsen | Halle | ||
| Olsen | John | Ulvin | |
| Olsen | Orvin | G | |
| Olsen | Peder | S | |
| Olsen | Ruth | Mathilda | |
| Olson | Alma | Andrea | Olson |
| Olson | Anna | Peterson | |
| Olson | Baby | ||
| Olson | Ben | ||
| Olson | Bonnie | M | Anderson |
| Olson | Edna | Thora | |
| Olson | Ella | Gurine | |
| Olson | Emil | Oliver | |
| Olson | Gustaf | Olie | |
| Olson | Harvey | ||
| Olson | Henry | N | |
| Olson | Herman | ||
| Olson | Ida | Marie | Kelley |
| Olson | Inger | Serine | Staum |
| Olson | Jerald | Eugene "Jerry" | |
| Olson | John | Lester | |
| Olson | John | ||
| Olson | Josie | ||
| Olson | Lavonne | Raye | Nootenboom |
| Olson | Lawrence | Arville | |
| Olson | Lorraine | Ethel | Kerns |
| Olson | Mathilda | Josephine | Mikkelson |
| Olson | Minnie | Emelia | |
| Olson | Myron | ||
| Olson | Nora | A | Johnson |
| Olson | Ole | S | |
| Olson | Oscar | Alle | |
| Olson | Ragnhild | Hagen | |
| Olson | Sarah | Rasmussen | |
| Olson | Selve | ||
| Olson | Syvert | ||
| Oman | Lucille | Ann | DeRemer |
| Oman | Vern | ||
| O'Neil | Lori | Ann | Sohre |
| Opplinger | Ima | Louise | Larson |
| Opplinger | Joseph | Hilary "Joe" | |
| Ore | Archie | ||
| Ore | Arthur | ||
| Ore | Odelia | McCollum | |
| Ore | Wesley | John | |
| Ormbreck | Aslak | ||
| Ormbreck | Olav | ||
| Osten | Adolph | G | |
| Osten | Cornelia | Unknown | |
| Osten | Gary | Luverne | |
| Osten | Hilma | M | Mickelson |
| Osten | Lilly | A | Nelson |
| Osten | Luverne | Merle | |
| Osten | Martin | ||
| Osten | Nellie | Aase | |
| Overlie | Alvin | Rudolph | |
| Overlie | Anders | E | |
| Overlie | Annie | Rose | |
| Overlie | Arnold | Bennett | |
| Overlie | Baby Son | ||
| Overlie | Beret | A "Betsy" | |
| Overlie | Erland | Anderson | |
| Overlie | Ingeborg | O | Unknown |
| Overlie | Johan | Walter | |
| Overlie | Mabel | Josephine | Nelson |
| Overlie | Ole | A | |
| Overlie | Ole | Emil | |
| Overlie | Ragnhild | Kjestad | |
| Overlie | Richard | G | |
| Overlie | Theodore | Joseph "Ted" | |
| Overlie | Thora | Elise | |
| Overlie | Walter |
