| Ottoville Graduation Classes 1940 to 1949 |
| Class of 1940 |
| Class of 1941 |
| Class of 1942 |
| Class of 1943 |
| Class of 1944 |
| Class of 1945 |
| Class of 1946 |
| Class of 1947 |
| Class of 1948 |
| Class of 1949 |