O
| Surname: | Given Name(s): | Date Naturalized: |
| Oakes | William H. | October 11, 1884 |
| Oates | James | February 20, 1860 |
| Oatley | John L. | November 6, 1876 |
| Obenecht | Ferdinand | August 15, 1867 |
| Ober | Alphonse | October 9, 1890 |
| Obermeyer | Henry Herman | October 11, 1852 |
| Obrembski | Boleslaw | September 22, 1915 |
| O’Brian | Owen | October 12, 1868 |
| O’Brian | John | October 7, 1876 |
| O’Brien | Dennis | September 29, 1854 |
| O’Brien | Patrick | October 8, 1855 |
| Ockenden | Frank | October 8, 1878 |
| Ockerhouse | Henry | October 8, 1867 |
| O’Connell | Thomas | October 9, 1877 |
| O’Connell | John | October 8, 1872 |
| O’Conner | John | October 4,1852 |
| O’Connor | Michael | October 16, 1899 |
| O’Connor | Charles | October 23, 1891 |
| O’Donnell | John | August 7, 1860 |
| O’Donnell | Wm. | August 3, 1894 |
| O’Donnell | Anthony | October 8, 1868 |
| O’Dowd | John | October 5, 1854 |
| O’Dowd | John | October 11, 1866 |
| Oeden | Englebert | October 5, 1854 |
| Oehlschegel | Henry | October 7, 1896 |
| Oester | Andreas | October 10, 1868 |
| Oettinger | Frederick | October 10, 1871 |
| Ohlig | Peter | November 3, 1891 |
| Okruhlica | Francis | March 17, 1944 |
| Okruhlica | Stefan | October 7, 1929 |
| Oldfield | James | April 1, 1887 |
| Oldfield | Thomas J | April 1, 1887 |
| Oldhouse | Barney | March 31, 1855 |
| Oldiges | Nicholas | October 24, 1903 |
| O’Leary | Daniel | September 29, 1880 |
| Olivas | Eloina Lopez | December 8, 1967 |
| Oliver | Frederick | June 2, 1860 |
| Ollerstetter | John | October 8, 1878 |
| Olson | Anemarie | April 7, 1944 |
| Olt | William | October 4,1860 |
| Oluich | Mari | September 22, 1936 |
| Omacht | Joseph | September 27, 1859 |
| O’Mealy | Patrick | October 18, 1846 |
| O’Melia | John | October 8, 1868 |
| Onay | Martin | October 6, 1855 |
| Ondrovic | Katarina | March 17, 1944 |
| Ondrovic | Michael | March 17, 1944 |
| Ondrovich | John | September 27, 1938 |
| Ondrovich | Pauline | March 23, 1945 |
| O’Neal | Dennis | March 28, 1860 |
| O’Neal | James | October 11, 1869 |
| O’Neill | Bridie | December 7, 1951 |
| O’Neill | James Patrick | February 20, 1957 |
| O’Neill | Jane | March 11, 1931 |
| Ongkiko | Carlos Martin, Jr. | December 21, 1973 |
| Openhegg | John | October 8, 1872 |
| Oppeld | George | September 26,1854 |
| Oprisa | Anna | March 23, 1945 |
| Oprisa | Theodore | March 17, 1944 |
| Orach | John | June 7, 1926 |
| Orach | Stephan | June 2, 1939 |
| Orchudesch | Zerline | March 9, 1943 |
| Orlando | Charles | September 17, 1940 |
| O’Roarke | Peter | October 4, 1845 |
| Orr aka Zerline Orchudesch | Elena | March 9, 1943 |
| Orth | William | October 5, 1854 |
| Orth | Emrich | March 10, 1924 |
| Orth | Joseph | September 18, 1928 |
| Orth | Mari Anna | April 6, 1938 |
| Orth | Mary | March 12, 1929 |
| Orth | Shirley Ann | May 10, 1963 |
| Ortolf | Andreas | October 26, 1886 |
| Orton | Roy Allen | November 14, 1941 |
| Orven | John I. | June 29, 1840 |
| Osborne | Frances | January 21, 1949 |
| Oshurst | Mary Benak | September 20, 1926 |
| Oshust aka Frank Osusth | Frank | March 10, 1924 |
| Oshust aka Katrina Osust | Katrina | March 12, 1929 |
| Ossmann | Conrad | October 3, 1854 |
| Osso | Assunda | June 4, 1943 |
| Osso | Salvatore | November 14, 1941 |
| Ostendorf | Matthias | March 12, 1855 |
| Osterberger | Henry J. | July 27, 1895 |
| Osterberger | Eleanora Hannelore | May 8, 1959 |
| Ostericher | Albert | November 30, 1907 |
| Osterman | Lorenzo | June 17, 1859 |
| Ostree | Henry | March 25, 1843 |
| Ostrowsky | Hersch | June 20, 1917 |
| Osust | Ignatz | March 10, 1924 |
| Osust | Josefin Macsejkovics | March 12, 1929 |
| Osusth | Frank | March 10, 1924 |
| Osusth | Catherine | October 2, 1934 |
| Oswald | John | October 2, 1844 |
| Oswald | Peter | October 24, 1891 |
| O’Toole | Frank | October 11,1870 |
| Ott | John R. | September 15, 1876 |
| Ott | William | October 4, 1860 |
| Ott | Anton | October 23, 1896 |
| Ott | August | October 15, 1900 |
| Otte | Francis Henry | October 3, 1867 |
| Otterstetter | Peter | October 31, 1891 |
| Ottman | Charles | October 25, 1900 |
| Ottmann | Charles | October 6, 1885 |
| Otto | John | October 2, 1851 |
| Otto | Charles | October 13, 1862 |
| Otto | Daniel | September 26, 1842 |
| Otto | Henry | October 13, 1862 |
| Overfelt | Goaby | July 27, 1855 |
| Overholts | Dagmar Charlotte | March 11, 1952 |
| Overmeyer | Henry | October 8, 1860 |
| Owen | Evan | September 14, 1826 |
| Owen | Anna Mueller | March 12, 1935 |
| Owens | James | November 5, 1894 |
| Owens | Thomas | October 9, 1862 |
| Owens | Bette Ann | December 14, 1962 |
| Oyen | John | August 15, 1860 |
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