| Surname | Given Name | Birth Date | Death Date | Cemetery Name | Cemetery Location |
| Oak | Carol L | 3 May 1921 | 27 May 2014 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Oakes | Gregory Lea | 22 Mar 1956 | 26 Aug 2009 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Oberhaus | E Patrick | 12 Apr 1946 | 23 Jan 2019 | Not Given | |
| Oberhaus | John Frank | 27 Jun 1934 | 8 May 2017 | St. Mary's Cemetery | Muscatine, Muscatine Co., IA |
| Oberhaus | Lina Sarah Logsdon | 6 Dec 1936 | 22 Aug 2022 | St Mary's Cemetery | Muscatine, Muscatine Co., IA |
| Oberhaus | Richard Paul | 18 Feb 1925 | 17 Oct 2009 | Not Given | |
| O'Brien | Charlene Gordy | 16 Apr 1925 | 28 Jan 2019 | Not Given | |
| O'Brien | Daryl Keith | 14 Jun 1956 | 19 Nov 2013 | Illinois City Cemetery | Illinois City, Rock Island Co., IL |
| Oeter | Darlene L | 8 Jul 1928 | 28 Apr 2017 | Trinity Episcopal Church Columbarium | Muscatine, Muscatine Co., IA |
| Oeter | William | 21 May 1927 | 12 Oct 2022 | Trinity Episcopal Columbarium | Muscatine, Muscatine Co., IA |
| Oeter | William Walter | 20 Oct 1956 | 28 Mar 2002 | Trinity Episcopal Church Columbarium | Muscatine, Muscatine Co., IA |
| O'Farrell | Sheila M VonDach | 3 Dec 1952 | 8 Apr 2021 | Not Given | |
| Ogilvie | Thomas F | 30 Jul 1931 | 29 Dec 2009 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Oien | David Lee | 10 Sep 1955 | 11 Apr 2014 | Oakdale Cemetery | Wilton, Muscatine Co., IA |
| O'Keefe | Harriet S | 11 Apr 1910 | 13 Jun 2000 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Olsen | Betty Garlock | 22 Nov 1935 | 21 Nov 2023 | Not Given | |
| Olson | George W | 22 Feb 1924 | 7 Oct 2017 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Olson | Helen Ruth | 18 Jul 1909 | 25 May 2006 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Olson | Owen Lovell | 23 Nov 1909 | 14 Oct 2000 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Olson-Miller | Deborah | 29 Sep 1952 | 19 Aug 2020 | Not Given | |
| Onken | Doris I | 26 Oct 1927 | 1 Apr 2018 | Drury-Reynolds Cemetery | Drury Twp., Rock Island Co., IL |
| Onken | Michael Gene | 16 Oct 1950 | 27 Sep 2018 | Not Given | |
| Opel | Jackwyn A | 7 Jan 1925 | 11 Mar 2012 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Oppelt | Alfred D | 23 Aug 1919 | 26 Jan 2003 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Oppelt | Shirley Jean | 7 Dec 1928 | 4 Nov 2009 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| O'Reilly | Bobbie Jean Edwards | 9 Sep 1951 | 7 Mar 2011 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| O'Reilly | Sylvia A Jipp | 6 Sep 1936 | 13 Jan 2014 | Oakdale Cemetery | Wilton, Muscatine Co., IA |
| Orman | Darrell C | | 28 Feb 2014 | Not Given | |
| Ormsby | Lois Marie | 22 Jun 1921 | 30 Apr 2014 | Oakdale Cemetery | Wilton, Muscatine Co., IA |
| O'Rourke | Thomas C | 21 Apr 1933 | 17 Jun 2015 | St Mary's Cemetery | Muscatine, Muscatine Co., IA |
| O'Rourke | Zenaida M | 29 Jul 1938 | 12 Apr 2012 | St Mary's Cemetery | Middleboro, Plymouth Co, MA |
| Orozco | Ofelia Arceo | 11 Mar 1941 | 5 Jun 2012 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Orr | Dorothy M | 11 Aug 1926 | 3 Feb 2006 | Indian Creek Cemetery | Columbus Junction, Louisa Co., IA |
| Orr | Jean J | 20 Sep 1938 | 28 Apr 2018 | Nichols Cemetery | Nichols, Muscatine Co.,IA |
| Orr | Jeffery L | 26 Jun 1967 | 4 Feb 2011 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Orr | John W | 3 Aug 1925 | 25 Oct 2007 | Indian Creek Cemetery | Columbus Junction, Louisa Co., IA |
| Orr | Karen M Erickson | 14 Jan 1940 | 17 Jun 2020 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Orr | Kenenth G | 5 Jan 1936 | 15 Jan 2011 | Nichols Cemetery | Nichols, Muscatine Co., IA |
| Orr | Melvin Leroy | 18 May 1921 | 14 Sep 2003 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Orr | R Gregory | 27 Nov 1951 | 12 Sep 2011 | St Mary's Cemetery | Muscatine, Muscatine Co., IA |
| Orr | Raymond G | 7 May 1927 | 14 Jun 2014 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Ortega | Christie Ann | 25 Dec 1970 | 11 Jun 2008 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Ortega | Guadalupe Gonzales | 20 Oct 1972 | 28 Aug 2019 | Not Given | |
| Ortiz | Maria C | 26 Apr 1928 | 29 Apr 2011 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Ortiz | Raul | 8 Jan 1952 | 24 Mar 2016 | Not Given | |
| Osborn | Barbara J | 30 Sep 1931 | 23 Nov 2000 | Memorial Lawn Cemetery | Ottumwa, Wapello Co., IA |
| Osborn | Bernard L | 26 Feb 1931 | 6 Nov 2007 | Memorial Lawn Cemetery | Ottumwa, Wapello Co., IA |
| Osborn | Dora Mae | 21 Apr 1943 | 23 Feb 2014 | Davenport Memorial Park Cemetery | Davenport, Scott Co., IA |
| Osborn | Jeffery L | 30 Aug 1952 | 12 Jan 2004 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Osborn | Melvin Randall | 15 Jul 1954 | 3 Jan 2014 | Sacramental Valley National Cemetery | Dixon, Solano Co., IA |
| Ostert | Maralida Newlin | 19 May 1918 | 16 Apr 2014 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Ostrander | Robert "Bob" E | 29 Jun 1918 | 3 Dec 2013 | Beaufort National Cemetery | Beaufort, Beaufort Co., SC |
| Othmer | Marcella Mae | 24 Mar 1940 | 2 Mar 2000 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| Othmer | Jerome | 28 Dec 1937 | 29 Aug 2013 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Othmer | Michael L | 8 Apr 1940 | 9 Oct 2005 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Othmer | Theodore E | 14 Dec 936 | 27 Sep 2011 | Memorial Park Cemetery | Muscatine, Muscatine Co., IA |
| O'Toole | Dorothea Margeurite | 29 Aug 1908 | 9 Apr 2002 | St Malachy's Cemetery | Ardon, Muscatine Co., IA |
| O'Toole | James Patrick | 10 Apr 1938 | 25 Nov 2021 | St Malachy's Cemetery | Ardon, Muscatine Co., IA |
| O'Toole | Jane Ann Olson | 30 Apr 1945 | 13 Nov 2020 | St Malachy's Cemetery | Ardon, Muscatine Co., IA |
| O'Toole | Karleen M | 9 Aug 1936 | 1 Dec 2008 | St Malachy's Cemetery | Ardon, Muscatine Co., IA |
| Otto | Gary B | 18 May 1945 | 5 Apr 2016 | Not Given | |
| Otto | Pamela D | 10 Oct 1959 | 11 Sep 2011 | Greenwood Cemetery | Muscatine, Muscatine Co., IA |
| Ourkhou | Kahina A | 27 Sep 2005 | 18 Nov 2022 | Not Given | |
| Oxborough | Mardelle C | 17 Feb 1922 | 2 May 2013 | St. Mary's Cemetery | Muscatine, Muscatine Co., IA |
