Birth Certificate Index 1909 to 1921 = O
This index to Calhoun County birth certificates, 1909 to 1921, is graciously provided by the State Historical Society of Iowa. July thru Dec. 1921 was compiled from FamilySearch. For names of parents and township of birth, search these names in the FamilySearch index of Iowa, County Births 1880-1935.
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| NAME | BIRTHDATE | MOTHER'S MAIDEN NAME |
| Oberhelm, Ardella | 17 May 1921 | Lehms |
| Oberhelm, Mardella | 17 May 1921 | Lehms |
| Oberhelman, Edna | 06 May 1915 | Bussa |
| Oberhelman, Florence | 18 Sept. 1915 | Zehms |
| Oberhelman, Helen | 27 Sept. 1910 | Zehms |
| Oberhelman, Lawrence Wm. | 15 Mar. 1913 | Zehm |
| Oberhelman, Marcella Marva | 03 Mar. 1919 | Onken |
| Oberhelman, Norman | 29 May 1914 | Zehrs |
| Obermiller, Marvin Lee | 24 Oct. 1918 | Flagel |
| Obermiller, Melvin Leroy | 03 Jan. 1917 | Slagel |
| O'Brien, Lois Kathleen | 02 Nov. 1921 | O'Brien |
| O'Brion, Elwood Allan | 14 Oct. 1917 | Hull |
| O'Brion, Hellen Marilynn | 19 Sept. 1916 | Graham |
| Obye, Katherine Joyce | 19 Dec. 1919 | Maple |
| Obye, Robert | 17 July 1914 | Maples |
| Obye, Walter | 21 Dec. 1916 | Mapel |
| O'Connell, Josephine | 10 July 1910 | O'Connell |
| O'Connell, Uceyle Catherine | 03 June 1920 | Risch |
| O'Connell, Virginia | 09 July 1916 | Best |
| O'Conner, Margaret Elizabeth | 02 Mar. 1915 | Eakin |
| O'Connor, Robert Lee | 13 Oct. 1913 | Eakin |
| Odell, Dorthy | 01 May 1914 | Odell |
| Odendahl, George Edward | 09 Nov. 1912 | Wieland |
| Oestereich, Ernest W. | 08 Oct. 1910 | Marshall |
| Oesterich, Marshal E. | 21 Aug. 1909 | Marshall |
| Oestreich, Priscilla Mildred | 30 Nov. 1919 | Hillmer |
| Oestreich, William Henry | 23 Feb. 1912 | Hillmer |
| O'Leary, Merle James | 24 June 1916 | Fondroy |
| Olsen, Leonard Andrew | 03 July 1918 | Freisner |
| Olson, Beatrice Alice | 28 Jan. 1920 | Herron |
| Olson, Hubert Elroy | 16 July 1916 | Johnson |
| Olson, Illiah Mary | 19 Apr. 1913 | Bates |
| Olson, Mary Vera | 10 May 1917 | Bates |
| Olson, Pearl Aleda | 19 June 1917 | Hanson |
| Oltmans, Raymond Fansen | 29 May 1915 | Liebets |
| O'Malley, John Raymond | 17 June 1911 | Burns |
| O'Malley, Matthew Robert | 03 May 1915 | Burns |
| Omann, (Baby Girl) | 18 Jan. 1913 | Hargaret |
| Omann, Donald Leroy | 27 Aug. 1918 | Zell |
| Omann, Leora Evelyn | 18 Dec. 1915 | Zell |
| Onann, Leona Helena | 18 Jan. 1914 | Hoeregott |
| Oneal, Robert G. | 26 Jan. 1915 | Rice |
| O'Neil, Majorie Marie | 04 Aug. 1909 | Gibble |
| Onnen, Gladys | 14 Apr. 1920 | Wiley |
| Onnen, Lawrence | 21 Sept. 1912 | Berner |
| Onnen, Leilla Irene | 22 Apr. 1911 | Berner |
| Onnen, Leo Ivan | 01 Mar. 1919 | Gerbracht |
| Onnen, Nadine Luella | 31 Dec. 1917 | Berner |
| Onnen, Vera Louise | 19 July 1911 | Gerbracht |
| Orr, Edith Grace | 16 Oct. 1914 | Bowman |
| Orskog, Lena Hansine | 12 May 1909 | Mjell |
| Orskog, Melverd Irwin | 25 Oct. 1914 | Mjell |
| Ort, Burney Edwin | 28 Aug. 1917 | Sharkey |
| Ort, Flossie N. | 27 Jan. 1918 | Patterson |
| Ort, Kenneth Lewis | 28 Jan. 1915 | Sharkey |
| Ort, Lura Norine | 18 Oct. 1919 | Sharkey |
| Ort, Warren Harding | 16 July 1921 | Sharkey |
| Orwig, David Franklin | 03 June 1913 | Patterson |
| Orwig, Edna Lucille | 15 Mar. 1911 | Patterson |
| Orwig, Leta Mildred | 26 Aug. 1909 | Patterson |
| Osborn, Charles Isaac | 11 Feb. 1921 | Wells |
| Osborn, Ellen May | 08 Mar. 1917 | Wells |
| Osborn, Lura Malissa | 14 Apr. 1909 | Godwin |
| Osborn, Ruth Pauline | 20 Nov. 1918 | Handy |
| Osborne, Merle Benjiman | 07 Feb. 1921 | Dahlke |
| Ost, Bertha Alvine Lilly | 22 June 1912 | Gross |
| Ostrander, George Benjamin | 14 July 1921 | Leonard |
| O'Sullivan, Eugene John | 1916 | Norton |
| Otrogge, Helen Ethel | 26 Aug. 1920 | Coulter |
| Otto, Merl Wayne | 24 Oct. 1917 | Otto |
| Otto, Bertha Irene | 19 Feb. 1911 | Otto |
| Otto, Dorothy | 01 Mar. 1918 | Otto |
| Otto, Eugene Raymond | 06 June 1917 | Jennings |
| Otto, Francis Irene | 04 Mar. 1912 | Barnes |
| Otto, Lizzie May | 23 Nov. 1910 | Barnes |
| Otto, Lloyd William | 12 Sept. 1919 | Dreeszen |
| Otto, Nellie Maud | 09 Nov. 1914 | Otto |
| Otto, P. Neva | 14 Dec. 1915 | Otto |
| Overton, Ada Estella | 26 Sept. 1912 | Tyler |
| Overton, Lester Charles | 15 Nov. 1915 | Taylor |
| Owells, Barton Raybold | 02 Apr. 1913 | Shockley |
| Owen, Chlorinne Maxine | 11 Aug. 1916 | Staton |
| Owen, Olive Leone | 17 July 1920 | Michaels |
| Owens, Roberta Jean | 19 Jan. 1921 | White |
| Owens, Helen Kathryn | 28 Jan. 1911 | White |
| Owens, Lois Elinor | 17 Mar. 1918 | Daugherty |
| Oxenford, James Kelley | 19 June 1920 | Kelley |
| Oxenford, Jean Elizabeth | 18 Mar. 1918 | Booth |
| Oxenford, Kenneth Wayde | 21 July 1920 | Booth |