| Last name | First Name | Sex | Date of Birth | Father | Mother | Place of Birth | Siblings | Box | Folder | Rec. No. |
| Oberly | F | 4 Oct 1893 | Charles Oberly | none listed | Plover, Portage Co., WI | 4 | 6 | 77 | ||
| O'Brien | Elizabeth C. | F | 24 Feb 1879 | James M. | Mary C. Riley | Stevens Point, Portage Co | Eddie, Rose, Lilley, Charles, Patie | 1 | 6 | 393 |
| O'Brien | Grace | F | 24 Feb 1879 | James O'Brien | Mary C. Riley | Stevens Point | Eddie, Rose, Lilly, Charles, Kate | 1 | 4 | 218 |
| Ocinor | M | 22 Jul 1893 | Melvin Ocinor | Edith Warner | Stevens Point, Portage Co., WI | 4 | 5 | 82 | ||
| Ockery | M | 6 May 1881 | John Ockery | Francis Hilensky | Stevens Point | 2 | 2 | 332 | ||
| O'Connor | Mathew Kenneth | M | 4 Mar 1889 | Thomas O'Connor | Agnes Campbell | Carson, Portage Co., WI | 4 | 1 | 13 | |
| O'Connor | M | 22 Oct 1888 | P. O'Connor | Agnes J. Swevin | Stevens Point, Portage Co., WI | 4 | 1 | 116 | ||
| O'Connor | F | 8 Dec 1894 | Pat O. O'Connor | Agnes Sullivan | Stevens Point, Portage Co., WI | 3 others | 5 | 3 | 107 | |
| O'Connor | M | 21 Oct 1896 | Patrick O'Connor | Agnes Sulivan | Stevens Point, Portage Co., WI | 4 others | 5 | 6 | 187 | |
| Ocra | M | 12 Apr 1885 | John Ocra | Francis Glenetskey | Stevens Point, Portage Co., WI | 2 boys | 3 | 4 | 196 | |
| Ocra | F | 13 Aug 1886 | John Ocra | Francis Glinskey | Stevens Point, Portage Co., WI | 3 boys | 3 | 5 | 155 | |
| Ocrgrlsch | Johann Stephan | M | 29 Aug 1895 | Michael Ocrgrlsch | Bertha | Stevens Point, Portage Co., WI | Michael, Anna | 5 | 4 | 226 |
| Oergish | Michael | M | 20 Feb 1893 | Michael Oergish | Bertha Hofmann | Stevens Point, Portage Co., WI | 4 | 5 | 29 | |
| Oester | M | 18 Nov 1884 | George Oester | Junction City, Portage Co., WI | 3 | 4 | 119 | |||
| Oesterle | M | 16 Feb 1885 | August Oesterle | Theresa Schleisman | Sharon, Portage Co., WI | 3 | 3 | 57 | ||
| Oesterle | F | 30 Dec 1888 | August Oesterle | Theresa Chliesman | Sharon, Portage Co., WI | Anthony | 4 | 1 | 44 | |
| Oestrich | M | 13 Nov 1897 | Charles Oestrich | Matilda Sprung | Plover, Portage Co., WI | Elmer Oestrich | 5 | 9 | 349 | |
| Ohm | M | 22 Feb 1887 | Ricke Ohm | Stevens Point, Portage Co., WI | Comment: Residence - Poor House | 3 | 6 | 31 | ||
| Ohocker | F | 29 Jan 1886 | S. C. H. Ohocker | Chastina St. Clare | Eau Pleine, Portage Co., WI | Effa H., Clara A., Daniel A., Ernest Clyde, Morgan, Gerald R. | 3 | 5 | 68 | |
| Ojtalewicz | Mary | F | 19 Jan 1897 | Mike Ojtalewicz | Mary Ojtalewicz | Polonia, Portage Co., WI | Mary Timinska | 5 | 8 | 169 |
| O'Keefe | Michael Henry | M | 15 Jul 1897 | Michael O'Keefe | Elisabeth Agnes Longbliss | Sharon, Portage Co., WI | Ray, Clarence | 5 | 9 | 291 |
| O'Keefe | Wm. Douglas | M | 20 Aug 1886 | John M. O'Keefe | Christina McDonnell | Stevens Point, Portage Co., WI | 3 | 5 | 81 | |
| O'Keefe | F | 15 Feb 1893 | Mike O'Keefe | none listed | Stockton, Portage Co., WI | 4 | 6 | 82 | ||
| O'Keeffe | F | 9 Aug 1896 | Willilam O'Keeffe | Anna Keeffe | Stockton, Portage Co., WI | one | 5 | 5 | 47 | |
| Okeria | M | 3 Sep 1883 | John Okeria | Francis Linexkey | Stevens Point, Portage Co., WI | 1 boy | 2 | 6 | 153 | |
| Okunienski | Andri | F | 17 Dec 1882 | Andri Okunienski | Ragyna Lipska | Buena Vista, Portage Co., WI | Dorota, Frenk, Jan, Jozef, Agustyn, Regyna | 2 | 4 | 182 |
| Okuniski | Mary | F | 22 Sep 1884 | Henry Okuniski | Regyna Lipsky | Buena Vista, Portage Co., WI | Lora, Frank, John, Joseph, Affe, Agustas | 3 | 1 | 117 |
| Olbrac | Kate | F | 26 Nov 1878 | Anton Olbrac | Takle Brzoskonski | Hull, Portage Co., WI | 5 girls, 6 boys | 1 | 5 | 221 |
| Olbrac | Mary | F | 23 Mar 1877 | John Olbranc | Josefine Brzrskonska | Hull, Portage Co., WI | 2 boys, 3 girls | 1 | 5 | 222 |
| Olbrane | Mary | F | 25 Jul 1874 | Anton Olbrane | Tacla Brzoskonski | Hull, Portage Co., WI | 5 boys, 4 girls | 1 | 5 | 219 |
| Olbrantz | Mathias | M | 25 Dec 1876 | Anton Olbrantz | Thecla Brzoskowska | Hull, Portage Co., WI | 5 boys, 4 girls | 1 | 5 | 220 |
| Olbrantz | Stephan | M | 8 Dec 1887 ** | Frank Olbrantz | Cecelia Zblaskowski | Hull, Portage Co., WI | 3 | 7 | 20 | |
| Olbrecc | Francis | F | 16 Apr 1879 | John Olbrecc | Josepin Brzokomski | Hull, Portage Co., WI | 4 girls, 2 boys | 1 | 5 | 223 |
| Older | Hazzel | F | 24 May 1896 | Frank Older | Julia M. Keating | Stevens Point, Portage Co., WI | Burnett Lee, Raymond, Forest, Rirri | 5 | 6 | 206 |
| Olds | Willie Fernando | M | 10 Feb 1881 | Daniel Fernando Olds | Sarrah Barrows | Stevens Point, Portage Co., WI | Daniel Elijah Olds | 2 | 1 | 60 |
| Olesen | M | 10 Aug 1893 | Thowald Olesen | Gunday Halversen | Stevens Point, Portage Co., WI | 4 others | 4 | 5 | 146 | |
| Oleson | Olaf Norman | M | 3 Oct 1896 | Halver Oleson | Nelaina Uillitsen | Whiting, Portage Co., WI | 5 | 6 | 113 | |
| Oleson | M | 11 May 1890 | Andrew Oleson | Mrs. Gurena Oleson | Stevens Point, Portage Co., WI | 4 | 2 | 47 | ||
| Oleson | F | 29 Mar 1883 | Andrew Oleson | Bertha Docka | Stevens Point | 2 | 5 | 43 | ||
| Oleson | M | 15 Mar 1885 | Lewis Oleson | Lena Peterson | Stevens Point, Portage Co., WI | 3 | 3 | 52 | ||
| Oleson | M | 30 Jan 1890 | Thorwold Oleson | Gunda Halverson | Stevens Point, Portage Co., WI | 3 others | 4 | 2 | 84 | |
| Oline | F | 25 Aug 1879 | Melvin Oline | Jennie Wyatt | Stevens Point | 1 | 4 | 306 | ||
| Olsen | Henry Nels | M | 27 Feb 1879 | Peter | Mary C. Anderson | Stockton, Portage Co | Louis | 1 | 6 | 323 |
| Olsen | Louis Anton | M | 26 Dec 1876 | Peter | Mary C. Anderson | Lanark, Portage Co | 0 | 1 | 6 | 321 |
| Olsmaskey | F | 21 Apr 1883 | Anton Olsmaskey | Katie Steckel | Stevens Point, Portage Co., WI | 3 girls, 3 boys | 2 | 6 | 154 | |
| Olson | Aarbivold | M | 26 Jun 1879 | Ole Olson | Johana Nichalson | Amherst, Portage Co., WI | 1 | 4 | 224 | |
| Olson | Anne | F | 21 Oct 1877 | Isak Olson | Marn Knudtson | New Hope, Portage Co., WI | 2 | 1 | 187 | |
| Olson | Clara | F | 27 Feb 1879 | Halvo Olson | Mary Pederson | New Hope, Portage Co., WI | 2 | 1 | 182 | |
| Olson | Ida | F | 12 Mar 1878 | Halvor Olson | Marn Pederson | New Hope, Portage Co., WI | 2 | 1 | 192 | |
| Olson | Ida | F | 4 Nov 1873 | Isak Olson | Marn Knudtson | New Hope, Portage Co., WI | 2 | 1 | 188 | |
| Olson | Ole | M | 4 Jan 1882 | Even Olson | Pauline Pederson | Amherst, Portage Co., WI | 2 | 4 | 26 | |
| Olson | Peter | M | 18 Apr 1882 | Peter Olson | Julia Cristison | Stevens Point, Portage Co., WI | 1 boy | 2 | 4 | 124 |
| Olson | Skjalotte Amalia Bertine | F | 4 Feb 1880 | Lars Olson | Hellen Olson | Amherst, Portage Co., WI | 2 | 1 | 168 | |
| Olson | Trevine | F | 11 Sep 1894 | Ole Olson | Gunvar Olson | Town 24 | 5 | 1 | 169 | |
| Olson | twins | M | 26 Mar 1888 | Thoruld Olson | Gunda Halverson | Stevens Point | Mabel | 3 | 7 | 168 |
| Olson | F | 14 Dec 1892 | Alex Olson | Sophia Nelson | Stevens Point, Portage Co., WI | five others | 4 | 5 | 113 | |
| Olson | M | 15 May 1886 | Antone Olson | Lena Halverson | Stevens Point, Portage Co., WI | 3 | 6 | 17 | ||
| Olson | F | 2 Jul 1886 | Carles Olson | Cunda Halverson | Stevens Point, Portage Co., WI | 0 | 3 | 5 | 133 | |
| Olson | M | 24 Aug 1883 | Enar Olson | Christine | Amherst | 2 | 5 | 90 | ||
| Olson | M | 1 Jan 1880 | Jack Olson | Maggie Gustavous | Stevens Point, Portage Co., WI | none | 1 | 5 | 324 | |
| Olson | M | 7 Apr 1893 | Mart Olson | Mattie Olson | Stevens Point, Portage Co., WI | 4 | 5 | 65 | ||
| Olson | F | 18 Mar 1889 | Nels Olson | Hansen Knuteson | Stevens Point, Portage Co., WI | Olif | 4 | 1 | 102 | |
| Olson | M | 26 Dec 1876 | Peter Olson | Mary Anderson | Lanark | 1 | 1 | |||
| Olys | M | 1877, Filed 24 Dec 1878 | Martin Olys | Stevens Point, Portage Co., WI | 1 | 3 | ||||
| O'Mara | M | 11 Oct 1890 | Pat O'Mara | Mary Dawson | Stevens Point, Portage Co., WI | 3 others | 4 | 2 | 69 | |
| Omarie | M | 31 Aug 1889 | Patrick Omarie | Mary Dawson | Stevens Point, Portage Co., WI | 2 others | 4 | 1 | 53 | |
| O'Marie | M | 27 Apr 1892 | Patrick O'Marie | Mary Dawson | Stevens Point, Portage Co., WI | 4 others | 4 | 4 | 159 | |
| O'Meara | M | 8 Nov 1893 | Patrick O'Meara | Mary Dawson | Stevens Point, Portage Co., WI | 5 others | 4 | 5 | 121 | |
| O'Meara ? | M | 21 Jan 1888 | Pat O'Meara ? | Mary Dawson | Stevens Point, Portage Co., WI | Agnes & Mary | 3 | 7 | 45 | |
| Omerie | M | 21 May 1893 | Anton Omerie | none listed | Sharon, Portage Co., WI | 4 | 6 | 46 | ||
| Omernick | Mairanna | F | 01 Aug 1881 | Antoni | Franciska Schmaglik | Sharon | 2 | 3 | 351 | |
| Omernik | Luciia | 13 Dec 1883 | Antoni Omernik | Francyska Szmaglyk | Sharon, Portage Co., WI | 2 | 6 | 179 | ||
| Onan | M | 29 Mar 1893 | Chas. Onan | Mantia Sherman | Stevens Point, Portage Co., WI | 3 others | 4 | 5 | 102 | |
| Onurie | M | 28 Aug 1891 | Antone Onurie | Sharon, Portage Co., WI | 4 | 3 | 132 | |||
| Opah | M | 28 Nov 1892 | Nicholis Opah | none listed | Stockton, Portage Co., WI | 4 | 6 | 208 | ||
| Orgitsch | Joseph | M | Aug 1897 | Michael Orgitsch | Theresia Weber | Stevens Point, Portage Co., WI | John, Michael, Theresia | 5 | 9 | 244 |
| Orlikowski | Adam | M | 30 Sep 1882 | Peter Orlikowski | Julianna | Hull, Portage Co., WI | 2 | 4 | 161 | |
| Orlikowski | M | 9 Aug 1884 | Pioter | Julianna | Sharon, Portage Co., WI | 3 | 1 | 184 | ||
| Orphyl | F | 21 Aug 1892 | L. Orphyl | Stevens Point, Portage Co., WI | 4 | 4 | 305 | |||
| Orvis | F | 26 May 1897 | Earnest B. Orvis | …any Richardson | Carson, Portage Co., WI | 5 | 7 | 81 | ||
| Oster | Mary Magdeline | F | 2 Feb 1888 | George E. Oster | Mary Celia Dulanty | Junction City, Portage Co., WI | 3 | 7 | 3 | |
| Oster | F | 12 Jan 1887 | A. R. Oster | Anna Brotten | Carson, Portage Co., WI | 3 | 6 | 120 | ||
| Oster | M | 2 Dec 1882 | Geo. E. Oster | Carson, Portage Co,, WI | 2 | 4 | 167 | |||
| Oster | F | 31 Dec 1892 | Geo. E. Oster | Amy Hyde | Stevens Point, Portage Co., WI | George C. | 4 | 5 | 4 | |
| Oster | F | 16 Aug 1894 | George E. Oster | Amy or Anna Hyde | Stevens Point, Portage Co., WI | Anna | 5 | 1 | 5 | |
| Oster | F | 27 Dec 1897 | George Oster | Amy Hyde | Stevens Point, Portage Co., WI | two others | 5 | 9 | 370 | |
| Oster | M | 3 Sep 1896 | Teo E. Oster | Amy Hyde | Stevens Point, Portage Co., WI | two others | 5 | 5 | 58 | |
| Ostrander | M | 22 Mar 1896 | Albert Ostrander | May Mahony | Pine Grove, Portage Co., WI | 5 | 5 | 18 | ||
| Ostrander | M | 25 Feb 1897 | Albert Ostrander | Mary Mahony | Pine Grover, Portage Co., WI | 5 | 7 | 20 | ||
| Ostrander | F | 2 Nov 1893 | Charles Albert Ostrander | May Mahoney | Pine Grove, Portage Co., WI | Clara, Clarence | 4 | 6 | 21 | |
| Ostrickie | Silvester | M | 16 Dec 1881 | George Ostrickie | Tilie Shuda | Stevens Point, Portage Co., WI | 1 boy | 2 | 3 | 464 |
| Ostriske | Stanslava | F | 7 Oct 1875 | John Ostriske | Miney Malack | Hull, Portage Co., WI | 1 girl | 1 | 7 | 319 |
| Ostrowski | Bernardus | M | 28 Oct 1897 | Peter Ostrowski | Joanna Szlenka | Sharon, Portage Co., WI | 5 | 9 | 286 | |
| Ostrowsky | Martyn | 13 Feb 1884 | Alexander Ostrowsky | Kata Jnca | Sharon, Portage Co., WI | 3 | 2 | 18 | ||
| Otmier | M | 6 Mar 1880 | Mr. Otmier | Maria Brunp | Stevens Point, Portage Co., WI | 2 boys, 2 girls | 1 | 5 | 330 | |
| Otmier | F | 12 (?) 1878 | Mr. Otmier | Stevens Point, Portage Co., WI | 1 | 3 | ||||
| Otto | M | 16 Aug 1894 | Frederick Otto | Mary Nelson | Almond, Portage Co., WI | Miny, Cary, Martha, Birtz, Willie, Johny, Mary | 5 | 1 | 1 | |
| Otto | F | 12 Dec 1895 | Henry Otto | Nettie Whitney | Almond, Portage Co., WI | 5 | 4 | 243 | ||
| Ovans | James | M | 21 Dec 1888 | David Ovens | Mary Ellen Lombard | Lanark, Portage Co., WI | Mary Ellen | 4 | 1 | 8 |