| Last Name | First Name | Description | Folder | Acc. No. |
| O"Conner | Patricia | 6th Gr. 1967-68 | School-City-Argos | #5898D |
| Oakes | Charles | 1936 Donaldson | School-County-West Twp. | |
| Oberg | David | Class of 1947 | School-city-Tyner | |
| Oberg | David | Jr.class 1945-6 | School-city-Tyner | |
| Oberly | Bill | 1st Gr. 1940-1 | School-City-Bremen | |
| O'Blenis | Cal | Green twp. teachers ca. 1885 | School-County-Green Twp. | |
| O'Bryan | Mary Alice nee Pesch | 55th Reunion Class of 1941 | School-City-Plymouth-Lincoln | |
| O'Connell | John | 4th Gr. 1961 | School-City-Plymouth-Webster | |
| O'Connor | Helen | Class of 1936 | School-City-Culver | |
| O'Connor | Mildred | 1st. Gr. 1933 | School-City-Bremen | |
| O'connor | Nick | 1st gr. 1927 | School-city-Tyner | |
| O'Connor | Tina | Kind. 1967-8 | Schools-City-Ply-Jefferson | #6206E |
| Odell | Raymond | 7th & 8th gr. 1946-7 | School-County-Green Twp. | |
| Odem | Gorden | 1st Gr. 1940-1 | School-City-Bremen | |
| Ogden | Alnora | 1939 grads | School-City-Culver | |
| Ogden | Hubert | 50th reun. Class of 1918 | School-City-Plymouth-Lincoln | #6406F |
| Ogden | Margaret | Class of 1936 | School-City-Culver | |
| Ogle | Betty Lou | 1st Gr. 1939-40 | School-City-LaPaz | |
| Ohara | Lucille | B | School-County-Green Twp. | |
| O'Hara | Darlene | 7th & 8th 1950-51 | School-County-Green Twp. | #2424-2 |
| O'Hara | Darlene | 1st & 2nd 1943-4 | School-County-Green Twp. | #3225B-7 |
| O'Hara | Dennis | 1952-3 | School-County-Green Twp. | |
| O'Hara | Dennis | 1951 | School-County-Green Twp. | #3225A-15 |
| O'Hara | Eugene | 7th & 8th gr. 1944-5 | School-County-Green Twp. | |
| O'Hara | Eugene | 5th Gr. 1942-3 | School-County-Green Twp. | |
| O'Hara | Eva | 7th & 8th gr. 1944-5 | School-County-Green Twp. | |
| O'Hara | Eva | 5th Gr. 1942-3 | School-County-Green Twp. | |
| O'Hara | Gene | B | School-County-Green Twp. | |
| O'Hara | Glenna Marie | 1st & 2nd 1943-4 | School-County-Green Twp. | #3225B-7 |
| Ohler | Jo Alyce | Study Hall 1949-50 | School-City-Ply.-Washington | |
| Ohler | Lucille | 1930 ca. | School-County-Walnut Twp. | |
| O'Keefe | Alves | #3 Frosh Class 1919 | School-City-Ply.-Washington | |
| O'Keefe | Arthur | Class of 1900 reunion in 1926 | School-City-Ply.-Washington | |
| O'Keefe | Cheryl L. | 1st 1951-52 | School-City-Ply.-Washington | #6429A |
| O'Keefe | Donald | 1937 group outdoors | School-City-Ply.-Washington | |
| O'Keefe | Donna nee Roush | 45th reunion class of 1950 | School-City-Plymouth-Lincoln | |
| O'Keefe | Katherine | #2 Freshman - 1919 | School-City-Ply.-Washington | |
| O'Keefe | Kevin | 3rd Gr. 1962 | School-City-Ply.-Washington | #5896F |
| O'Keefe | Shawn | Kind. 1960-1 | School-City-Ply.-Washington | |
| Olds | Helen nee Pesch | 50th reun. Class of 1947 | School-City-Plymouth-Lincoln | |
| Olds | Helen nee Pesch | 25th reunion Class of 1947 | School-City-Plymouth-Lincoln | |
| Olds | Larry | School Board | Schools- City- Plymouth- Officials | |
| Olds | Richard | 3rd gr. 1976-7 | School-City-Ply-Wash #2 | #5898B |
| Oler | Lucille nee Greenlee | 1st and 2nd Gr. 1927 | School-County-Walnut Twp. | #6254A |
| Oler | Madeline | 1st Gr. 1928-9 | School-City-Argos | #4164-I |
| Olin | Kenneth | staff 1976 | School-City-Ply-Wash #2 | #5895G |
| Olin | Kenneth | 3rd gr. 1976-7 | School-City-Ply-Wash #2 | #5898C |
| Olin | Kenneth | 3rd Gr. 1974-5 | School-City-Ply-Wash #2 | #5895I-1 |
| Olin | Kenneth | 3rd gr. 1976-7 | School-City-Ply-Wash #2 | #5898B |
| Olivares | Sandra | Kind. 1988-9 P.M | Schools-City-Ply-Jefferson | #6205C |
| Olivarez | Cooky | 3rd Gr. 1979-80 | School-City-Ply-Wash #2 | #5897C-1 |
| Olivaries | Jose | 3rd Gr. 1963 | School-City-Ply.-Washington | #5900B |
| Oliver | Billy | 3rd Gr. 1969-70 | School-City-Ply.-Washington | #5895F |
| Oliver | Kenneth teacher | 7 & 8 Gr.1925-6 | School-City-LaPaz | |
| Olsen | Amy | Kind. 1990-1 A.M. | Schools-City-Ply-Jefferson | #6205G |
| Olsen | Myrtle | Brick School 1914 | School-County-West Twp. | |
| Olson | Carol | 3rd Gr. 1957-8 | School-City-Plymouth-Webster | |
| Olson | Carol | 1936 Donaldson | School-County-West Twp. | |
| Olson | Carol | Donaldson 1937-8 | School-County-West Twp. | #6586 |
| Olson | Carol | Donaldson 1937-8 SBT 443 | School-County-West Twp. | #6619B |
| Olson | Harry | 1936 Donaldson | School-County-West Twp. | |
| Olson | Harry | Donaldson 1937-8 | School-County-West Twp. | #6586 |
| Olson | Jane | 1930-1 | School-County-West Twp. | |
| Olson | Jane | 1930-1 West | School-County-West Twp. | |
| Olson | Karl | Class of 1938-West | School-County-West Twp. | |
| Olson | Mary | Class of 1895 | School-City-Ply.-Washington | #753C |
| Olson | Virginia | Donaldson 1937-8 | School-County-West Twp. | #6586 |
| Omstott | teacher | 1927-8 | School-City-Tippecanoe | |
| O'Neil | Dessie nee Overmyer | 1909 Mt. Pleasant | School-County-Union Twp. | #5754A |
| Onken | Deanna | 3rd. Gr. 1967-8 | School-City-Argos | #5895C |
| Ooley | Andrea | 3rd. Gr. 1969-70 | School-City-Bourbon | |
| Ooley | Ruth Ann | 1st Gr. 1951-52 | School-City-Bourbon | #2915F-6 |
| O'Reilley | Basil | Band 1945-6 | School-City-Culver | |
| Orr | Betty | 7th and 8th 1935-6 | Schools-City-Inwood | #1729C |
| Orr | Betty | 5th and 6th 1936-7 | Schools-City-Inwood | #1729C |
| Orr | Betty | Gr. 5, 6, 7, 8 | Schools-City-Inwood | |
| Orr | Janice | 5th and 6th 1947-8 | Schools-City-Inwood | |
| Orr | Janice | 7th and 8th 1949-50 | Schools-City-Inwood | |
| Orr | Janice | 1947-8 | Schools-City-Inwood | |
| Orr | Janice | 1948-9 | Schools-City-Inwood | |
| Orr | Janice | 5th and 6th 1948-9 | Schools-City-Inwood | |
| Orr | Marcia | 1950-1 | Schools-City-Inwood | |
| Orr | Myrtle | Donaldson 1937-8 | School-County-West Twp. | #6586 |
| Orr | Patricia | Class of 1942 | School-City-Plymouth-Lincoln | #2161D |
| Orr | Patricia | class of 1942 | School-City-Plymouth-Lincoln | |
| Orr | Robert | 1943 boys saluting | School-City-Ply.-Washington | |
| Osborn | Glenda | 7th & 8th 1940 | School-County-Green Twp. | #2424-1 |
| Osborn | Glenda | 7th & 8th 1950-51 | School-County-Green Twp. | #2424-2 |
| Osborn | Joanna | 4th Gr. 1926-27 | School-City-Ply.-Washington | |
| Osborn | Lucy M. | Class of 1964 | School-City-Culver | |
| Osborn | Marvin | 7th & 8th 1940 | School-County-Green Twp. | #2424-1 |
| Osborn | Marvin | 7th & 8th 1950-51 | School-County-Green Twp. | #2424-2 |
| Osborn | Nina | 1938 band trip | School-City-Bourbon | |
| Osborn | Rosemary | 3rd and 4th gr. 1949 | School-County-Green Twp. | #3225A5 |
| Osborn | Wm. O. | NHS | School-City-Argos | #5839D |
| Oscarson | Roy | Class of 1947 | School-city-Tyner | |
| Oscarson | Roy | Jr.class 1945-6 | School-city-Tyner | |
| Ott | Harold Wayne | Class of 1951 | School-City-LaPaz | #6117A |
| Ott | Jack | 50th reunion Class of 1949 | School-City-Plymouth-Lincoln | |
| Ott | Jack | 45th reunion Class of 1949 | School-City-Plymouth-Lincoln | |
| Otto | Alice | West 1957 | School-County-West Twp. | |
| Otto | Alice | 10th Gr. 1955 West | School-County-West Twp. | |
| Otto | Alice | 11th Gr. 1956 West | School-County-West Twp. | |
| Ottow | Alice | 1954-55 Sunshine Club | School-County-West Twp. | |
| Ottow | Alice | 1953 Sunshine Club | School-County-West Twp. | |
| Ottow | Beatrice | Class of 1960 yellow folder | School-County-West Twp. | |
| Ottow | Beatrice nee Bollman | West class of 1937 | School-County-West Twp. | #3699D |
| Ottow | Linda | 3rd Gr. 1962 | School-City-Ply.-Washington | #5896F |
| Ottow | Melenie | West students 1953 | School-County-West Twp. | #6017C |
| Ousley | Rachel | Kind. 1987-8 A.M. | Schools-City-Ply-Jefferson | #6205B |
| Ousnamer | Jack | 45th reunion Class of 1944 | School-City-Plymouth-Lincoln | |
| Ousnamer | Jimmy | 1954-5 | School-City-Ply.-Washington | #6034C |
| Ousnamer | Mike | 3rd Gr. 1972-3 | School-City-Ply-Wash #2 | #5898F |
| Ousnamer | Stephen | 1957-8 group of 4 | School-City-Ply.-Washington | #6034H |
| Ousnamer | Steve | 1957-8 | School-City-Ply.-Washington | #6034E |
| Ousnamer | Tim | 3rd Gr. 1973-4 | School-City-Ply-Wash #2 | #5897G |
| Overall | Erma | Gr. 3&4 1929-30 | School-City-Bourbon | |
| Overdeer | Verne | Palmer Method | School-City-Ply.-Washington | |
| Overholser | William | SBT photo #467 | Schools- City- Plymouth- Officials | |
| Overholt | Erma | 715 | Schools-City-Inwood | |
| Overholt | Fern | 1927-8 | Schools-City-Inwood | |
| Overholt | Fern | 1926-7 | Schools-City-Inwood | |
| Overholt | Jacob | 8th Gr. 1932 | School-City-Bourbon | #2424-6 |
| Overmyer | Alberta nee Hepler | 1938 PHS group | School-City-Plymouth-Lincoln | |
| Overmyer | Alberta nee Hepler | 4th gr. 1929=30 | School-City-Ply.-Washington | 2626D |
| Overmyer | Art | 8th Gr. 1952-3 | School-City-Argos | #2445B-1 |
| Overmyer | Art | 7th Gr. 1951-2 | School-City-Argos | #2445A-1 |
| Overmyer | Betty | Burr Oak 1936-7 | School-County-Union Twp. | |
| Overmyer | Billy Lee | Class of 1946 | School-City-Culver | |
| Overmyer | Clifford | Washington 1915 | School-County-Union Twp. | #5756A |
| Overmyer | Coleena | 1961-2 | School-City-Ply.-Washington | #6034F |
| Overmyer | Dale | Burr Oak School 1934-5 | School-County-Union Twp. | |
| Overmyer | Dale | Burr Oak 1935-6 | School-County-Union Twp. | |
| Overmyer | Dale | Burr Oak 1936-7 | School-County-Union Twp. | |
| Overmyer | Danni | Kind. 1978-9 A.M. | Schools-City-Ply-Jefferson | #6203F |
| Overmyer | Darrel | 1st & 2nd 1934-5 | School-County-Green Twp. | |
| Overmyer | Darrel | 1st & 2nd gr. 1935-6 | School-County-Green Twp. | |
| Overmyer | Darrell | 2nd Gr. 1939-40 | School-County-Green Twp. | |
| Overmyer | Darrell | 3rd Gr. 1940-1 | School-County-Green Twp. | |
| Overmyer | Donna | Kind. 1978-9 A.M. | Schools-City-Ply-Jefferson | #6203F |
| Overmyer | Donnie | Burr Oak ca. 1926 | School-County-Union Twp. | |
| Overmyer | Dora | Washington 1915 | School-County-Union Twp. | #5756A |
| Overmyer | Dorothy nee Flagg | 1909 Mt. Pleasant | School-County-Union Twp. | #5754A |
| Overmyer | Earl D. | Maxinkuckee 1925-6 | School-County-Union Twp. | #3675D |
| Overmyer | Edward | Class of 1944 | School-City-Tippecanoe | |
| Overmyer | Edward | Washington 1915 | School-County-Union Twp. | #5756A |
| Overmyer | Ethel | abt. 1929 | School-City-Tippecanoe | |
| Overmyer | Ethel | 402 | School-City-Tippecanoe | |
| Overmyer | Ethel | 392 | School-City-Tippecanoe | |
| Overmyer | Ethel | 1932-3 | School-City-Tippecanoe | #5240A |
| Overmyer | Frank | 8th Gr. 1954-5 | School-City-Argos | |
| Overmyer | Frank | 7th Gr. 1953-4 | School-City-Argos | |
| Overmyer | Gerald | PHS Orchstra 1911 | School-City-Ply.-Washington | |
| Overmyer | Gerald | Orchestra 1912 | School-City-Ply.-Washington | #5760A |
| Overmyer | Irvin | Burr Oak School 1934-5 | School-County-Union Twp. | |
| Overmyer | Irvin | Burr Oak 1935-6 | School-County-Union Twp. | |
| Overmyer | Jean | Maxinkuckee 1936 | School-County-Union Twp. | |
| Overmyer | Joyce | Class of 1951 | School-City-Culver | |
| Overmyer | Kathryn | Class of 1942 grads | School-City-Argos | |
| Overmyer | Kathryn | 7th & 8th 1950-51 | School-County-Green Twp. | #2424-2 |
| Overmyer | Kathryn | 7th & 8th gr. 1936-7 | School-County-Green Twp. | #5548A |
| Overmyer | Kay | Class of 1964 | School-City-Culver | |
| Overmyer | Kenneth | 8th Gr. 1956-7 | School-City-Argos | #2445B-4 |
| Overmyer | Kenneth | 7th Gr. 1955-6 | School-City-Argos | #2445A-4 |
| Overmyer | Lenora | 1st & 2nd 1943-4 | School-County-Green Twp. | #3225B-7 |
| Overmyer | Lloyd | 7th Gr. 1941-42 | School-City-LaPaz | #5838C |
| Overmyer | Lloyd | 1940-1 Linkville | Schools-County-North | |
| Overmyer | Marilyn | Class of 1946 | School-City-Culver | |
| Overmyer | Marilyn | Burr Oak School 1934-5 | School-County-Union Twp. | |
| Overmyer | Marilyn | Burr Oak 1935-6 | School-County-Union Twp. | |
| Overmyer | Marilyn | Burr Oak 1936-7 | School-County-Union Twp. | |
| Overmyer | Marilyn E. | 1946 grads | School-City-Culver | |
| Overmyer | Meril | 7th & 8th 1948-9 | School-County-Green Twp. | #2424-3 |
| Overmyer | Meril | 1935 | School-County-Green Twp. | #3225B-2 |
| Overmyer | Merl | 1944-45 | School-County-Green Twp. | #3225A3 |
| Overmyer | Mick | 8th Gr. 1956-7 | School-City-Argos | #2445B-4 |
| Overmyer | Mick | 7th Gr. 1955-6 | School-City-Argos | #2445A-4 |
| Overmyer | Russell | Burr Oak ca. 1926 | School-County-Union Twp. | |
| Overmyer | Todd | 1922 | School-City-Tippecanoe | #2914A |
| Overmyer | Wendell | Maxinkuckee 1925-6 | School-County-Union Twp. | #3675D |
| Overmyer | Wilda Jean | Class of 1942 | School-City-Culver | #5786A |
| Overmyer | William L. | 1946 grads | School-City-Culver | |
| Overstreet | Irene | PHS bus. Club 1940 | School-City-Plymouth-Lincoln | #3983C |
| Oviedo | Milli | Kind. 1986-7 P.M. | Schools-City-Ply-Jefferson | #6204I |
| Owen | Robert | 1st grade 1926 | School-City-Bourbon | #2424 |
| Owens | John | 7th Gr. 1956-7 | School-City-Argos | |
| Oyler | Avis | Hibbard 1917 | School-County-Union Twp. | |
| Oyler | Claire | Hibbard 1917 | School-County-Union Twp. |