| Index No. | Fee Book | ||||||
| Estate of | Case No. | Book | Page | Book | Page | Date of Filing | Remarks |
| Oberg, Carlana Marie | 4191 | 47 | 1 | 5 | 591 | Aug. 12, 1960 | Guardianship |
| Oberg, Vernon Harry | 4191 | 47 | 1 | 5 | 591 | Aug. 12, 1960 | Guardianship |
| Oberst, Sharon Kay | 2499 | 3 | 99 | 1937 | Adoption | ||
| Oblinger, Uriah W. | 519 | 2 | 195 | 2 | 144 | 1901 | Deceased |
| O'Brien, Charles | 2584 | 3 | 184 | 1938 | Adoption | ||
| O'Brien, Charles J. | 3233 | 4 | 233 | 4 | 233 | July 30, 1948 | Deceased |
| O'Brien, James T. | 4823 | 53 | 1 | 7 | 53 | Oct. 25, 1966 | Deceased |
| O'Brien, John J. | 4180 | 47 | 1 | 5 | 580 | July 19, 1960 | Deceased |
| O'Brien, John J. | 2584 | 3 | 184 | 1938 | Adoptive Parent | ||
| O'Brien, Joseph | 3163 | 4 | 163 | 1947 | Guardianship | ||
| O'Brien, Joseph | 3261 | 4 | 261 | 4 | 261 | Jan. 3, 1949 | Guardianship |
| O'Brien, Joseph | 3937 | 44 | 1 | 5 | 337 | Jan. 18, 1958 | Deceased |
| O'Brien, Kathleen | 5449 | 58 | 1 | 8 | 49 | June 29, 1972 | Guardianship |
| O'Brien, Kathryn V. | 6208 | microfilm | 9 | 163 | Feb., 1979 | Deceased | |
| O'Brien, Kathryn Veronica | 2584 | 3 | 184 | 1938 | Adoptive Parent | ||
| O'Brien, Peggy (Infant of) | 2205 | 2 | 75 | 1933 | Adoption | ||
| Ochee, Wilhelmina | 1096 | 3 | 182 | 2 | 234 | 1916 | Deceased |
| O'Connell, Gertrude | 643 | 2 | 259 | 3 | 23 | 1906 | Guardianship |
| O'Connell, James | 643 | 2 | 259 | 3 | 23 | 1906 | Guardianship |
| O'Connell, James V. | 596 | 2 | 235 | 2 | 224 | 1904 | Deceased |
| O'Connell, Jennie | 643 | 2 | 259 | 3 | 23 | 1906 | Guardianship |
| O'Connell, Margarete | 643 | 2 | 259 | 3 | 23 | 1906 | Guardianship |
| O'Connell, Mary | 643 | 2 | 259 | 3 | 23 | 1906 | Guardianship |
| O'Connell, Mary A. | 636 | 2 | 255 | 3 | 16 | 1905 | Deceased |
| O'Conner, Sam | 2518 | 3 | 118 | 1937 | Guardianship | ||
| O'Connor, Albert B. | 3262 | 4 | 262 | 4 | 262 | Jan. 6, 1949 | Deceased |
| O'Connor, Andrew | 2167 | 2 | 37 | 1931 | Deceased | ||
| O'Dea, J. G. | 2941 | 3 | 541 | 1944 | Guardianship | ||
| O'Dea, James W. | 5007 | 54 | 1 | 7 | 207 | Aug. 12, 1968 | Deceased |
| O'Dea, John G. | 2991 | 3 | 591 | 1945 | Deceased | ||
| Odell, Ammon E. | 3612 | 39 | 1 | 5 | 12 | Sept. 15, 1953 | Deceased |
| Ogden, Alvin | 1111 | 3 | 190 | 4 | 249 | 1916 | Deceased |
| Ogden, Edward H. | 1300 | 3 | 287 | 5 | 121 | 1919 | Deceased |
| Ogilvis, Margaret O. | 1828 | 1 | 11 | 1927 | Deceased | ||
| Ogorzolka, John J. | 2190 | 2 | 60 | 1932 | Deceased | ||
| Ogorzolka, Joseph | 1830 1/2 | 1 | 14 | 1927 | Deceased | ||
| Ogorzolka, Julia | 5895 | microfilm | 8 | 495 | Aug. 9, 1976 | Deceased | |
| Ogorzolka, Mary E. | 2350 | 2 | 220 | 1935 | Deceased | ||
| Ogorzolka, Mary Martha | 2349 | 2 | 219 | 1935 | Deceased | ||
| O'Hare, Frank H. | 6665 | microfilm | 9 | April, 1983 | Deceased | ||
| O'Hare, Frank H. | 1290 | 3 | 282 | 5 | 111 | 1919 | Deceased |
| O'Hare, Lucy M. | 6666 | microfilm | 9 | April, 1983 | Deceased | ||
| Ohlson, Augusta | 2373 | 2 | 243 | 1935 | Deceased | ||
| Ohlson, Benjamin St. Mabel | 5446 | 58 | 1 | 8 | 46 | June 26, 1972 | Deceased |
| Ohlson, Joleen Carole | 5688 | 60 | 1 | 8 | 288 | July 16, 1974 | no comment |
| Ohlson, Joseph E. | 764 | 3 | 3 | 3 | 147 | 1908 | Guardianship |
| Ohlson, Ralph L. | 6682 | microfilm | 9 | June, 1983 | Deceased | ||
| Okerson, Rudoph L. | 1230 | 3 | 252 | 5 | 51 | 1918 | Deceased |
| Olcott, Ben Wade | 2517 | 3 | 117 | 1937 | Guardianship | ||
| Olcott, Benjamin F. | 935 | 3 | 93 | 4 | 70 | 1912 | Deceased |
| Oleott, Elizabeth | 4129 | 46 | 1 | 5 | 539 | Feb. 8, 1960 | Deceased |
| Olmstead, Abraham V. | 1879 | 1 | 62 | 1928 | Deceased | ||
| Olmstead, Alice R. | 1911 | 1 | 94 | 1928 | Deceased | ||
| Olmstead, Mary A. | 1482 | 4 | 91 | 5 | 303 | 1921 | Deceased |
| Olmstead, Oren J. | 1762 | 4 | 234 | 5 | 583 | 1926 | Deceased |
| Olmsted, Charles D. | 3461 | 38 | 1 | 4 | 461 | Aug. 7, 1951 | Conservatorship |
| Olmsted, Charles D. | 3812 | 42 | 1 | 5 | 212 | Apr. 30, 1956 | Deceased |
| Olson, Bertha K. | 5875 | microfilm | 8 | 475 | June, 1976 | Deceased | |
| Olson, Carolyn | 3104 | 4 | 104 | 1946 | Guardianship | ||
| Olson, Floyd Alta | 6219 | microfilm | 9 | 174 | April, 1979 | Deceased | |
| Olson, Janice | 3104 | 4 | 104 | 1946 | Guardianship | ||
| Olson, Joan | 3104 | 4 | 104 | 1946 | Guardianship | ||
| Olson, William G. | 2916 | 3 | 516 | 1944 | Deceased | ||
| Olson, Winnie J. | 5379 | 57 | 1 | 7 | 579 | Jan. 24, 1972 | Deceased |
| O'Neil, Alice | 3444 | 37 | 1 | 4 | 444 | Apr. 24, 1951 | Guardianship |
| O'Neil, Bernadine | 3444 | 37 | 1 | 4 | 444 | Apr. 24, 1951 | Guardianship |
| O'Neil, Edna L. | 5543 | 59 | 1 | 8 | 143 | Apr. 11, 1973 | Deceased |
| O'Neil, Jerry | 3444 | 37 | 1 | 4 | 444 | Apr. 24, 1951 | Guardianship |
| O'Neil, Michael | 3444 | 37 | 1 | 4 | 444 | Apr. 24, 1951 | Guardianship |
| O'Neil, Patrick | 3183 | 4 | 183 | 1947 | Guardianship | ||
| O'Neil, Thomas John | 4024 | 45 | 1 | 5 | 424 | Nov. 20, 1958 | Deceased |
| O'Neill, Catherine C. | 5354 | 57 | 1 | 7 | 554 | Nov. 3, 1971 | Foreign Will/Deceased |
| Orman, Andrew H. | 1624 | 4 | 164 | 4 | 447 | 1924 | Deceased |
| Orman, August | 5849 | microfilm | 8 | 449 | Apr. 13, 1976 | Deceased | |
| Orman, Henry H. | 4990 | 54 | 1 | 7 | 190 | June 17, 1968 | Deceased |
| Orman, Mary E. | 5193 | 56 | 1 | 7 | 393 | July 23, 1970 | Deceased |
| Orman, Walter F. | 5841 | microfilm | 8 | 441 | Mar., 1976 | Deceased | |
| Orman, William P. | 4699 | 52 | 1 | 6 | 499 | Sept. 28, 1965 | Deceased |
| Orr, Mildred | 6210 | microfilm | 9 | 165 | March, 1979 | Deceased | |
| Osborn, Charles S. | 6063 | microfilm | 9 | 19 | Feb., 1978 | Conservatorship | |
| Osborn, Charles S. | 6356 | microfilm | 9 | 310 | July, 1980 | Deceased | |
| Osborn, Ernest F. | 3860 | 43 | 1 | 5 | 260 | Nov. 24, 1956 | Deceased |
| Osborn, Geraldine L. | 6064 | microfilm | 9 | 20 | Feb., 1978 | Deceased | |
| Osborn, Iona | 1236 | 3 | 255 | 5 | 57 | 1918 | Deceased |
| Osborn, Laura A. | 2992 | 3 | 592 | 1945 | Deceased | ||
| Osborn, M. R. | 2801 | 3 | 401 | 1942 | Deceased | ||
| Osborn, Robert Milton | 1110 | 3 | 189 | 4 | 248 | 1916 | Deceased |
| Osborn, Ross B. | 1983 | 1 | 167 | 1929 | Adoptive Parent | ||
| Osborn, Ross B. | 2402 | 3 | 2 | 1936 | Deceased | ||
| Osborne, Iona A. | 1863 | 1 | 47 | 1927 | Deceased | ||
| Osborne, Richard D. | 2899 | 3 | 499 | 1944 | Deceased | ||
| Osburn, Clara J. | 6444 | microfilm | 9 | 398 | April, 1981 | Deceased | |
| Osburn, Ella S. | 6304 | microfilm | 9 | 258 | Jan., 1980 | Deceased | |
| Osburn, Fred | 4347 | 49 | 1 | 6 | 147 | Apr. 24, 1962 | Deceased |
| Ostdiek, Rose Shutte | 4274 | 48 | 1 | 6 | 74 | June 16, 1961 | Deceased |
| Overstake, Henry | 967 | 3 | 110 | 4 | 102 | 1913 | Deceased |
| Overstake, Lizzie | 4210 | 47 | 1 | 6 | 10 | Sept. 23, 1960 | Deceased |
| Owen, Richard W. | 1297 | 3 | 286 | 5 | 118 | 1919 | Deceased |
| Owens, George R. | 5352 | 57 | 1 | 7 | 552 | Oct. 26, 1971 | Deceased |
| Oxley, Elizabeth | 4730 | 52 | 1 | 6 | 530 | Dec. 30, 1965 | Deceased |
| Oxley, Everett | 1382 | 4 | 40 | 5 | 203 | 1920 | Deceased |
| Oxley, Franklin Pierce | 2454 | 3 | 54 | 1936 | Deceased | ||
| Oyster, Adella Margaretha | 3458 | 38 | 1 | 4 | 458 | July 24, 1951 | Deceased |
| Oyster, Adella Marguerita | 834 | 3 | 39 | 3 | 216 | 1910 | Guardianship |
| Oyster, Granville R. | 377 | 2 | 124 | 1 | 208 | 1895 | Deceased |
| Oyster, Howard | 4039 | 45 | 1 | 5 | 439 | Jan. 7, 1959 | Deceased |
| Oyster, Margaret E. | 2056 | 1 | 240 | 1930 | Deceased | ||
| Oyster, Mina | 5529 | 59 | 1 | 8 | 129 | Mar. 14, 1973 | Deceased |