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| Name on Obituary | Birth date | Death date | Maiden name | R.O. Date | Mom's maiden |
| Oates, Agnes J. | 1908-05-02 | 1991-03-02 | Nelson | 1991-04-11 | Westegard |
| Oates, Howard | 1908-11-28 | 1992-12-12 | 1992-12-17 | Taylor | |
| Oberheim, Stanley L. 'Tim' | 1931-02-17 | 1994-05-01 | 1994-05-05 | Stakemiller | |
| Oelke, Clyde K. | 1901-07-24 | 1990-04-08 | 1990-04-12 | Recob | |
| Oleson, Elmer S. | 1914-07-12 | 1993-04-21 | 1993-04-29 | Rust | |
| Oleson, Robert 'Bob' | 1937-05-29 | 1994-08-11 | 1994-09-01 | ||
| Oliver, Carroll G. | 1916-07-24 | 1993-02-26 | 1993-03-04 | Clements | |
| Oliver, Dallas M. | 1920-05-12 | 1992-12-13 | 1992-12-17 | Draves | |
| Oliver, Orrin 'Bud' | 1919-10-06 | 1998-03-07 | 1998-03-12 | Noggle | |
| Olmstead, Lavern | 1914-12-15 | 1998-01-27 | 1998-01-29 | Hunter | |
| Olsen, James A. | 1949-02-01 | 1996-10-21 | 1996-10-24 | Hoffman | |
| Olsen, Marie C. | 1905-05-02 | 1992-10-05 | Cull | 1992-10-08 | Bauer |
| Olson, Albert Jr. | 1933-02-28 | 1998-10-19 | 1998-10-22 | Erickson | |
| Olson, Anthony P. 'Boo' | 1911-06-28 | 1994-06-09 | 1994-06-16 | Schmitz | |
| Olson, Barbara J. | 1934-09-26 | 1998-07-15 | Faga | 1998-07-23 | Olson |
| Olson, Belinda A. | 1983-01-07 | 1992-04-28 | Olson | 1992-05-07 | Olson |
| Olson, Catherine R. | 1918-04-25 | 1999-05-18 | Anderson | 1999-05-20 | Walsh |
| Olson, Dean L. | 1930-09-20 | 1998-04-06 | 1998-04-09 | Rakow | |
| Olson, Elgia | 1916-01-18 | 1998-02-28 | McDaniel | 1998-03-05 | Ward |
| Olson, Elva B. | 1903-08-26 | 1994-11-25 | Rhinerson | 1994-12-01 | Gilbertson |
| Olson, Gary W. | 1946-08-22 | 1989-12-28 | 1990-01-04 | Faherty | |
| Olson, Geneva L. | 1920-06-29 | 1992-07-01 | Johnson | 1992-07-09 | Croniger |
| Olson, Gertrude A. | 1900-10-27 | 1992-11-10 | Anderson | 1992-11-19 | Anderson |
| Olson, Gordon A. | 1919-01-18 | 1992-05-26 | 1992-06-04 | Thompson | |
| Olson, Harold A. | 1922-05-23 | 1994-08-31 | 1994-09-08 | Joredth | |
| Olson, Kenneth A. | 1913-01-09 | 1998-02-06 | 1998-02-12 | Tuttle | |
| Olson, Lillian A. | 1922-08-14 | 1998-05-19 | Lischka | 1998-05-21 | Gabriel |
| Olson, Milan C. | 1918-10-26 | 1993-11-02 | 1993-11-04 | Lovlien | |
| Oman, Harry A. | 1918-04-01 | 1996-02-14 | 1996-02-22 | Zimpel | |
| Oomens, John W. | 1912-12-20 | 1992-02-02 | 1992-02-06 | Snelders | |
| Opitz, Nita | age 67 | 1993-07-06 | Cooper | 1993-07-08 | |
| Orcutt, James 'Jim' R. | 1932-07-12 | 1996-05-01 | 1996-05-09 | Haas | |
| Orsburn, Edith H. | 1905-12-22 | 1994-06-23 | Lowery | 1994-06-30 | Smith |
| Orsburn, George A. | 1915-03-17 | 1995-03-05 | 1995-03-16 | Dary | |
| Orth, Carl P. | 1917-10-06 | 1990-02-19 | 1990-02-22 | Ley | |
| Orth, Mae V. | 1922-01-07 | 1990-12-04 | Atkinson | 1990-12-13 | Patton |
| Orth, Mary E. | 1889-10-24 | 1990-12-15 | Ley | 1990-12-20 | |
| Ortman, Avis J. | 1923-03-02 | 1991-10-12 | Clark | 1991-10-17 | Janney |
| Osborne, Dorothy M. | 1930-05-08 | 1991-10-29 | Jansen | 1991-11-07 | Ross |
| Osborne, Harvey L. | 1924-05-31 | 1999-08-20 | 1999-08-26 | Sneath | |
| Osborne, Robert F. | 1926-03-13 | 1994-09-03 | 1994-09-15 | Fry | |
| Ostrander, Connie | 1989-12-20 | 1990-01-25 | |||
| Ostrander, Kiana | 1998-01-17 | 1998-01-21 | Ostrander | 1998-01-29 | Nutter |
| Ostrander, Theresa P. | 1913-04-28 | 1998-07-22 | Mulholland | 1998-07-30 | Kelly |
| Otis, Gladys I. | 1918-03-25 | 1998-08-03 | Reuschlein | 1998-08-06 | Foust |
| Ottesen, Otto S. | 1902-06-15 | 1997-03-15 | 1997-03-20 | Sampson | |
| Outhouse, Evelyn M. | 1918-03-21 | 1994-02-26 | Weeden | 1994-03-17 | Janney |
| Owen, Roy 'Tom' I. | 1911-05-06 | 1999-06-06 | 1999-06-10 | Gibeaut |
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