O Surnames
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| Name | Age | MS | Nativity | Admitted | Discharged | Died | Co. of Res. | Nearest Kin/Guardian/Notes |
| Oatmann, Elizabeth | 44 | ma | Germany | 14 Oct 1868 | 25 May 1875 | Stark | Henry Oatman, husband, Camp Grove; sent to Elgin Hospital | |
| O'Brien, Ellen | 24 | si | Ireland | 22 Aug 1855 | 9 Sep 1857 | Winnebago | John O'Brien, Rockford | |
| O'Brien, John | 21 | si | Ireland | 23 Oct 1866 | 24 Sep 1867 | Cook | Mrs. Mary O'Brien, mother, 264 4th Avenue, Chicago | |
| O'Brien, John | 23 | si | Ireland | 30 Oct 1868 | 12 Oct 1869 | Cook | buried State Hospital Grounds | |
| O'Brien, Mary | 28 | si | Ireland | 30 Oct 1868 | 13 Jul 1869 | Cook | ||
| O'Brien, Michael | 28 | ma | Ireland | 1 Feb 1870 | 7 Mar 1877 | Macoupin | Mrs. Bridget O'Brien, mother, Shipman | |
| O'Brien, Teresa | 15 | si | Pa | 18 Aug 1857 | 1 Feb 1858 | Logan | A. J. Turley, brother-in-law, Atlanta | |
| O'Brien, Teresa | 18 | si | Pa | 31 Jan 1862 | 15 Feb 1862 | Logan | ||
| O'Connell, Catherine | 36 | ma | Ireland | 25 Sep 1863 | 25 Nov 1863 | Livingston | Patrick O'Connell, husband, Pontiac | |
| O'Connell, Honora | 30 | ma | Ireland | 6 Feb 1862 | 4 Aug 1862 | McLean | ||
| O'Conner, Joanna | 30 | ma | Ireland | 26 Jan 1866 | 24 Apr 1866 | Montgomery | ||
| O'conner, Thomas | 60 | ma | Ireland | 14 Feb 1860 | 4 Jan 1862 | Sangamon | ||
| O'Conner, William | 19 | si | IL | 21 Sep 1865 | 25 Sep 1876 | LaSalle | Michael O'Connor, father, Deer Park | |
| O'Connor, Patrick | 26 | ma | Ireland | 23 Dec 1854 | 3 May 1855 | Cook | ||
| O'Connor, Thomas | 50 | ma | Ireland | 6 Nov 1857 | __ Feb 1858 | Sangamon | ||
| O'Connor, Thomas | 50 | ma | Ireland | 19 Aug 1859 | 17 Sep 1859 | Sangamon | ||
| Odell, Ann J. | 52 | wi | Ct | 25 May 1864 | 13 Sep 1864 | Cook | ||
| O'Donnell, Hugh | 32 | si | Ireland | 31 Dec 1869 | 9 Mar 1872 | Livingston | ||
| O'Donnell, Jerry | 26 | si | Ireland | 29 Jul 1867 | 17 Sep 1867 | Cook | "From state penitentiary"; "Eloped" | |
| Oesterholtz, Mary | 33 | ma | Germany | 6 Mar 1855 | 2 Jul 1855 | Cass | Barnard osterholz, husband, Beardstown | |
| Ogle, Mary E. | 20 | ma | Oh | 6 May 1858 | 9 Jun 1858 | Morgan | J. W. Ogle, husband, Arcadia | |
| O'Kane, Mary | 21 | si | IL | 1 Nov 1864 | 23 Jul 1868 | Lee | ||
| O'Kane, Mary | 26 | si | IL | 5 Oct 1867 | 21 Dec 1869 | Lee | ||
| Oldham, George | si | 1 Jun 1855 | 12 Jul 1857 | Gallatin | buried State Hospital Grounds | |||
| Oliver, Agnes | 33 | ma | Scotland | 22 Jun 1860 | 29 Mar 1861 | Stark | ||
| Olsen, Sophia B. | 44 | ma | NH | 6 Aug 1862 | 26 Aug 1863 | Cook | rufas Blanchard, brother, Chicago | |
| Olson, Andrew | 28 | si | Norway | 4 Feb 1870 | 12 Jan 1871 | Cook | Capt. Thomas Williams, friend, Chicago | |
| O'Neal, Henry | 40 | ma | Ireland | 24 Dec 1859 | 24 Jul 1859 | Madison | Mary O'Neal, wife, Alton | |
| O'Neil, Darby | 27 | ma | Ireland | 26 May 1857 | 1 Jul 1858 | Kane | ||
| O'Neil, Ellen | 53 | si | Ky | 26 Mar 1855 | 12 Jun 1855 | Morgan | Thomas O'Neil, brother, Jacksonville | |
| Ong, Jacob | 28 | si | Pa | 10 Feb 1865 | 23 Sep 1870 | Putnam | John Ong, father, Henry, Marshall Co. | |
| Ong, Nathan | 42 | ma | Pa | 24 Jun 1869 | 11 Oct 1869 | LaSalle | bro. to Jacob; | |
| Ong, Nathan | 43 | ma | Pa | 30 Dec 1869 | 18 Jul 1870 | LaSalle | Wife of Wenona, IL; buried on state hospital grounds | |
| Opie, Albert V. | 53 | ma | Ky | 23 Oct 1868 | 28 Dec 1868 | Peoria | Mrs. Nancy Opies, wife, Trivoli | |
| Oppenheimer, Lottie | 33 | ma | Bohemia | 29 Jan 1869 | 21 Apr 1871 | Ogle | Moses Oppenheimer, husband, Forreston | |
| Orr, Samuel W. | 24 | si | Oh | 11 Apr 1866 | 2 Oct 1866 | Coles | ||
| Orth, Philip | 30 | si | Germany | 7 Jun 1855 | 28 Apr 1859 | Kendall | ||
| Osborn, Philander | 42 | ma | NY | 2 Apr 1869 | 25 Dec 1869 | Rock Island | Mrs. P. Osborn, Moline, IL | |
| Osborne, Bartholomew | 50 | ma | Tn. | 9 Jun 1866 | 23 Apr 1867 | Greene | ||
| Osborne, Susan | 16 | si | Ky | 7 Feb 1856 | 3 Dec 1857 | Pike | ||
| Ost, Augustus | 36 | ma | Germany | 27 Sep 1858 | 27 Sep 1858 | Cook | ||
| Oster, Rosana | 37 | ma | Germany | 27 Jul 1865 | 23 Apr 1866 | JoDaviess | ||
| Otey, Elizabeth a. | 24 | wi | WI | 23 Jun 1866 | 21 Sep 1870 | JoDaviess | Samuel Alderson, father, Council Hill | |
| Ott, Catherine | 34 | wi | Germany | 15 Apr 1861 | 15 Apr 1864 | Mercer | F. Stebenger, brother, Keithsburg | |
| Ott, James W. | 16 | si | IL | 17 Aug 1865 | 19 Apr 1866 | LaSalle | O. Ott, father, Mendota | |
| Ottignon, Anna | 21 | ma | England | 4 Sep 1862 | 3 Dec 1862 | Cook | H. G. Ottignon, husband, Chicago | |
| Outhouse, Israel T. | 45 | ma | IL | 19 Oct 1865 | 16 Jan 1866 | Fayette | William S. Outhouse, brother, Carlyle | |
| Outhouse, Israel T. | 47 | ma | IL | 29 May 1869 | 15 Jun 1869 | Fayette | Mrs. I. T. Outhouse, wife, Patoka | |
| Outhouse, John W. | 30 | ma | IL | 24 Apr 1867 | 5 Feb 1874 | Clinton | Mrs. Nancy Outhouse, wife, Collins Station | |
| Overhiser, Celestia | 27 | ma | NY | 19 Jan 1866 | 20 Jul 1866 | Ogle | J. C. Overhiser, husband, Rochelle | |
| Owens, isaac | 19 Mar 1866 | 10 Dec 1867 | Tazewell | |||||
| Owings, Cynthia | 53 | ma | Tn. | 1 Oct 1869 | 9 Dec 1869 | Scott | Mordecai Owings, Winchester | |