| Name | Age | Admitted | By Order of trustee | Discharged | Remarks/Comments | Page |
|---|
| O’Connor, Matthew | | 2 Mar. 1876 | | 7 Mar. 1876 | Discharged | 34 |
| Oaf, Levi | | 18 Dec. 1875 | Walnut Twp. Trustee | 19 May 1876 | Discharged by own request | 33, 35 |
| Oaf, Levi | | 9 Dec. 1878 | Center Township | | | 48 |
| Oaf, Levy | | 21 Sep. 1879 | Center Township | | | 51 |
| Oaf, Mary | | 2 Feb. 1878 | Center Township | 7 Apr. 1878 | gave birth to child | 43. 45 |
| Oaf, Mary & child | | | | 30 Apr. 1878 | Discharged | 45 |
| Oconnell, Caty & child | | | | 8 Apr. 1878 | Discharged | 45 |
| Oconnell, Kate | | | | 22 July 1877 | Daughter born | 41 |
| Odonel, John | | 15 Dec. 1883 | Polk Township | 13 Mar. 1884 | Discharged | 78, 79 |
| Ohara, Patrick | 78 | 1 Dec. 1868 | Original List of Residents | 9 Apr. 1874 | Died | 4, 27 |
| Ohmer, M. T. | 43 | 12 Jan. 1875 | Polk Twp. Trustee | 28 Apr. 1875 | Died | 30 |
| Ohmer, Mrs. M. T. & child | 27 | 12 Jan. 1875 | Polk Twp. Trustee | | | 30 |
| Olemonson (Swede) | | 30 Sept. 1876 | West Twp. Trustee | 10 Nov. 1876 | Died | 36, 37 |
| Olinger, Jacob | 73 | 16 April 1898 | Center Twp. | 20 Apr 1898 | Place of birth and age unknown. Taken away by his son John. | RB |
| One Dane | 40 | 26 Sept. 1873 | Polk Twp. Trustee | 15 Oct. 1873 | Discharged | 24, 25 |
| Osborn, Mrs. & 3 children | | | | 24 Apr. 1880 | Discharged | 54 |
| Osborn, Mrs. & 3 children | | 24 June 1880 | Walnut Township | 4 Aug. 1880 | Discharged | 54, 55 |
| Osborn, Sarah | | 27 Jan. 1880 | West Township | 16 Mar. 1880 | gave birth to child | 53 |
| Owens,John | 10 | 12 Jan. 1872 | North Twp. Trustee | 6 Apr. 1872 | Discharged | 19 |