| Surname (Maiden) | First & Middle Name (Spouse) | Date of Birth | Date of Death | Cemetery |
| Oartwieg | Harlan (Asbrene Ellen Caukins) | 4 Jun 1911 | 13 Dec 1993 | Baxter Restland |
| Oartwieg (Caukins) | Ellen (Harlan) | 23 Sep 1918 | 9 Nov 1993 | Baxter Restland |
| Oberlander | M. A. "Obie" | 3-Jun-1909 | 28-Jul-1978 | Kellogg Our Silent City |
| Oberlander (Craven) | Laurel Jean (Milburne) | 29-Jul-1920 | 18-May-1982 | Kellogg Our Silent City |
| O'Brien | Michael Emmett (Alice Ruth Pope) | 20-Sep-1917 | 7-Apr-1987 | Sacred Heart |
| O'Brien | Mabel Lillian (Miss) | 27 Jan 1889 | 11-Dec-1983 | St. Andrew's |
| Offill | Floyd Vernon | 17-May-1900 | 00 Apr 1983 | Waveland |
| Ogburn (Warfield) | Gloria (Dale) | 10-Apr-1927 | 18-Aug-1983 | Colfax Highland |
| Ogden | Charles L. (Eleanor Viola Blankenfeld) | 28-Mar-1910 | 12-Feb-1988 | Newton Memorial Park |
| Ogden (Blankenfeld) | Eleanor Viola (Charles L.) | 4-Oct-1913 | 17-Mar-1986 | Newton Memorial Park |
| O'Halloran (Butler) | Ruth M. (Randall J.) | 28-May-1919 | 8-Nov-2002 | Palo Alto |
| O'Hara (Baustian) | Shirley Phyllis (Richard) | 13 Oct 1936 | 20 Jan 1997 | Sacred Heart |
| Oldham | James L. (Kiana "Jackie" Allen) | 27 Feb 1940 | 16 Dec 1996 | Monroe Silent City |
| Oldham | Ordell (Margueritte ?) | 6-May-1911 | 26-Aug-1978 | Monroe Silent City |
| Oldham | Grace (Miss) | 29 Oct 1893 | 7-Jan-1981 | Monroe Silent City |
| Oldham | James A. (Helen Harper) | 28-Nov-1912 | 16-Jun-1987 | Our Silent City |
| Oldham (Harper) | Helen (James) | 14 Oct 1914 | 18 Sep 1994 | Monroe Silent City |
| Oldham (Herwehe) | Emma (H. T.) | 20 Sep 1884 | 18-Dec-1978 | Monroe Silent City |
| Oldham (Nimmo) | Janet Marguerite (Chasley Ordell) | 12 Jul 1917 | 4 Jun 1995 | Monroe Silent City |
| Oleson | Dale G. "Red" | | 05 Feb 2004 | Cremation |
| Oliver | Anzel LeRoy (Katie Edith Vance) | 4 Aug 1908 | 8 Jun 1993 | Newton Memorial Park |
| Oliver | Donald A. | 8-Dec-1903 | 3-Aug-1984 | Newton Memorial Park |
| Oliver | Gertrude (Richard) | 31 Dec 1912 | 10 Nov 1994 | Monroe Silent City |
| Oliver (VerSteeg) | Elizabeth Gelene (Donald A.) | 19 Sep 1903 | 20 Feb 1997 | Newton Memorial Park |
| Olsen | Peter Nels (Marie duVignau) | 8 Jul 1894 | 7 Sep 1991 | Newton Memorial Park |
| Olsen (duVignau) | Marie (Peter N.) | 16 Apr 1897 | 17-Jul-1988 | Newton Memorial Park |
| Olson | Alexander James | 5 Nov 1991 | 19 Jan 1996 | McKeever |
| Olson (Brown) | Estella (Carl Lust, Ernest Lull & Albin Olson) | 17 Jul 1900 | 9 Jan 1992 | Palo Alto |
| Olsthoorn | Francis Henry | 3-Feb-1922 | 20-Jul-1984 | Sully |
| Olsthoorn | Lambert (Irene Bennink & Anna Montgomery) | 15 Jul 1910 | 7 Aug 1995 | Sully |
| Olsthoorn | Anna (Miss) | 2-Jul-1904 | 7-Aug-1983 | Sully |
| Olsthoorn | Arie (Hattie Bruxvoort) | 25-Jul-1907 | 2-Jun-1987 | Newton Memorial Park |
| Olsthoorn (Worth) | Janice (William Livingston & Arie Olsthoorn) | 1-May-1912 | 24-Apr-1988 | Monroe Silent City |
| Orcutt | Joyce Lorraine (Miss) | 13 Nov 1922 | 21 Sep 1997 | Colfax Highland |
| Orcutt (Harper) | Colleyn Virginia | 13-Mar-1901 | 23-May-1981 | Colfax Highland |
| O'Riley (Bates) | Wanda H. (Bill Hopkins & Wayne O'Riley) | 13 Jun 1928 | 25 Dec 1994 | Monroe Silent City |
| Orlich | George (Selma Pearson & Venita Longellier) | 2-Jul-1907 | 30-Jul-1986 | McKeever |
| Orlich | Mitchell "Mike" | 11-Apr-1911 | 19-Jan-1985 | Colfax Highland |
| Orlich (Farver) | Alberta "Betty" (Mitchell "Mike") | 14 May 1919 | 24 Feb 1993 | Colfax Highland |
| Orlich (Foshe) | Bonnie (Eli) | 14 Feb 1929 | 8 May 1998 | Colfax Highland |
| Orman | Thaddeus C. "Ted" | 8-Jan-1911 | 19-Apr-1983 | Sugar Grove |
| O'Roake | James Donald "Don" | 31-Dec-1916 | 26-Feb-2002 | Sacred Heart |
| O'Roake (Hoffstatter) | Allene (Don) | 18-Feb-1920 | 19-Apr-1983 | Sacred Heart |
| O'Roake (Morgan) | C. Elaine (Francis) | 16 Aug 1925 | 06 Sep 2004 | Sacred Heart |
| Orr | Harry Robert (Darlene Bollhoefer) | 12 Jan 1921 | 23 Jan 1994 | Baxter Restland |
| Orr | John W. | 26-Jun-1907 | 00 Feb 1983 | Baxter Restland |
| Orr | Wayne K., Sr. | 16-Sep-1923 | 2-Feb-1988 | Baxter Restland |
| Orr (Cammack) | Ilo Mildred | 1-Sep-1913 | 26-Apr-2003 | Baxter Restland |
| Orr (Meyer) | Martha (Elmer) | 3-Jul-1922 | 10-Oct-1983 | Baxter Restland |
| Osborn | Ralph | 3 Mar 1894 | 23-Sep-1981 | Ashton |
| Osborn | William "Fred" | 18-Oct-1902 | 23-May-1984 | Baxter Restland |
| Osborn | Keith A. (Deborah Wertz) | 8 Oct 1953 | 6 Apr 1993 | Kellogg Our Silent City |
| Osborn | Lloyd Eugene (Corinne Price) | 30 Mar 1927 | 24 Oct 1993 | Vandalia |
| Osborn | Harold Dean (Verna Sager) | 20-Nov-1921 | 26 Oct 1996 | Colfax Highland |
| Osborn (Brown) | Violett Louise (William Frederick) | 30 Mar 1907 | 6 Apr 1996 | Baxter Restland |
| Osborn (Osten) | Imogene S. (Everett E.) | 17 Nov 1921 | 31 Oct 1995 | St. John's |
| Oswalt | Gary Luke | 00 Jul 1981 | 00 Jul 1981 | Newton Memorial Park |
| Oswalt (De Bolt) | Virginia (Edward) | 31-Jul-1927 | 7-Oct-1979 | Colfax Highland |
| Oswalt (Koopman) | Lola K. (Harve) | 18 Jul 1903 | 27 Aug 1997 | McKeever |
| Otis (Stickley) | Avonell (C. Wilbur) | 24 Apr 1897 | 18-Oct-1981 | Union Chapel |
| Otten | Melis | 3 Jun 1897 | 12-Dec-1983 | Sully |
| Otten (Van Gilst) | Marie R. (Melis) | 15 Sep 1894 | 19-Jun-1981 | Sully |
| Otto (Culver) | Esther (Ralph) | 17 Jul 1897 | 28-Feb-1982 | Bethany, Indep Twp. |
| Overdyk (Colyn) | Nellie E. (W. T. "Pete") | 15 Jul 1897 | 11-Oct-1987 | Waveland |
| Owen (Bruxvoort) | Gertrude (Harold) | 24-Dec-1904 | 20-Sep-1985 | Sully |
| Owens | Dave (Vera Terpstra) | 17-Jan-1906 | 22-Mar-1986 | Colfax Highland |
| Owens | Donald E. | 29-Jan-1924 | 29-Jan-1985 | Lynnville Woodland |
| Owens | Edris "Soapy" (Thelma Wicks) | 11 Dec 1914 | 23 Sep 1998 | Palo Alto |
| Owens | Leonard | 1 Mar 1891 | 26-Nov-1984 | McKeever |
| Owens | Leonard R. | 15-Oct-1948 | 23-Feb-1982 | Colfax Highland |
| Owens | Leonard Thomas | 29-Apr-1918 | 30-Mar-1986 | McKeever |
| Owens | Ray O. | 20 Oct 1922 | 28 Mar 1995 | McKeever |
| Owens | Raymond | 28-Jul-1902 | 31-Jan-1984 | Colfax Highland |
| Owens | Roger W. (Lillian Smith & Helen Hoffert Rose) | 31 Dec 1918 | 11 Jun 1994 | Colfax Highland |
| Owens | Timothy O. "Tim" (Nancy S. Craig) | 7 Nov 1957 | 10 Oct 1990 | Sacred Heart |
| Owens | Ralph E. | 25-Apr-1911 | 3-Apr-1981 | Colfax Highland |
| Owens | Verlan J. (Carol Guddendorf) | 21 Jun 1937 | 9 Dec 1993 | Rock Creek |
| Owens (Borts) | Esther E. | 27-Dec-1929 | 2-Aug-1988 | Greencastle |
| Owens (Danks) | Jennie D. (Ralph) | 29-Aug-1915 | 22-Mar-1981 | Colfax Highland |
| Owens (Gardner) | Evelyn May (Robert Richard) | 22 Jul 1931 | 31 Jul 1993 | Union Chapel |
| Owens (Terpstra) | Vera Cathryn (Dave) | 10-Aug-1906 | 8-Jan-1988 | Colfax Highland |
| Owens (Wicks) | Thelma Mae (Edris) | 16-Sep-1912 | 8-Feb-1983 | Palo Alto |
| Owens (Woodyard) | Edna Minerva (Leonard) | 31 Oct 1892 | 24-Nov-1982 | McKeever |
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