| NAME | BORN | DIED | COMMENTS | LOCATION |
| O'Brien, Amanda Little | 9/15/1873 | 12/11/1933 | Sec 14, Lot 29 | |
| O'Brien, W.F. | 1883 | 1/27/1940 | Husband | Sec 2, N 1/2 Lot 1 |
| O'Hare, Florence M. | 1875 | 11/20/1959 | N 1/2 Sec 24, Lot 15 | |
| O'Hare, William M. | 1872 | 7/28/1960 | Sec 24, Lot 15 | |
| O'Neel, Jessie | 1880 | 6/11/1964 | Sec. 2, Lot 22 | |
| O'Neel, Ruth | 1880 | 1937 | Sec 2 | |
| Oberg, Mary E. | 10/4/1935 | Married 6/26/1954 Wife of Robert Oberg | Sec 3 | |
| Oberg, Robert J | 3/16/1935 | 5/9/1991 | Husband of Mary Oberg | Sec 3, Lot N 1/2 Lot 10 |
| Oester, Jim Eugen | 2/15/1959 | 6/24/1984 | Father of Joshua Thomas Oester | Sec 13, Lot 11 |
| Ohda, Frank | 6 months | Sec 14 | ||
| Ohda, Fred | 3/8/1930 | 19 months | Sec 14 | |
| Ohda, Mabel P. | 1908 | 2/7/1972 | Mother | Sec 14, Lot 2 |
| Ohde, Friedrich J. | 1/31/1850 | 2/19/1909 | Sec 13, | |
| Ohde, Henry | 10/6/1891 | 11/4/1958 | Ill Pvt. Co B 45 Inf. WWI | Sec 9, Lot 30 |
| Olds, Dorothy A | 2/3/1920 | 11/30/1992 | Wife of Lloyd D | Sec 19, Lot 38 |
| Olds, Lloyd d | 4/22/1915 | Husband of Dorothy A | Sec 19 | |
| Olsson, John W. | 1865 | 3/29/1951 | Sec 1, Lot 26 | |
| Oltman, Anna M. | 1886 | 5/28/1948 | Mother, Wife of Louis Oltman | Sec 2, Lot 18 |
| Oltman, Louis H. | 1886 | 1/16/1937 | Father, Husband of Anna Oltman | Sec 2, S 1/2 Lot 2 |
| Oltmanns, Francis J. | 6/2/1923 | 9/27/1987 | Sec 24, Lot 5 1/2 | |
| Oltmanns, Johnnie | 9/12/1903 | 6/12/1910 | Son of H & L Oltmanns | Sec 13, |
| Oltmanns, Louis B. | 12/2/1892 | 8/16/1971 | Sec 24, Lot 5 | |
| Oltmanns, Minnie U. | 9/16/1892 | 2/14/1973 | Sec 24, N 1/2 Lot 25 | |
| Oltmanns, Wayne L. | 7/16/1925 | 6/26/1996 | Sec 24, Lot 5 | |
| Onnen, Janken | 9/20/1837 | 6/25/1912 | Sec 13, | |
| Onnen, John B. | 8/1/1838 | 9/2/1908 | Sec 13, | |
| Ordean, Chirila | 3/4/1887 | 2/5/1976 | Sec 25, Lot 17 | |
| Ordean, Eva | 10/25/1903 | 7/5/1983 | Sec 25, Lot 17 | |
| Orr, Ella Viola | 8/27/1887 | 5/10/1888 | Children of J. & L.P. Orr | Sec 16 |
| Orr, Frank H. | 6/12/1889 | 8/7/1901 | Children of J. & L.P. Orr | Sec 16 |
| Orr, Isaac | 4/16/1847 | 1/17/1892 | Children of J. & L.P. Orr | Sec 16 |
| Orr, John J. | 7/24/1884 | 7/27/1892 | Children of J. & L.P. Orr | Sec 16 |
| Orr, Lottie T. Britt | 1862 | 3/6/1922 | Wife of William Orr | E.F.S.A., Sec A Lot 6 |
| Orr, William | 1859 | 9/7/1949 | Husband of Lottie Orr | E.F.S.A, Lot 6A |
| Osmunden, Kirsten | 1865 | 6/24/1933 | Sec 1, Lot 5 | |
| Osmundsen, Ben W. | 1863 | 12/16/1937 | Sec 1, Lot 5 | |
| Otten, Albert | 1900 | 8/26/1937 | Father | Sec 2, S 1/2 Lot 43 |
| Otten, Kenneth | 1932 | 1949 | Son | Sec 2 |