| Ottoville Graduation Classes 1970 to 1979 |
| Class of 1970 |
| Class of 1971 |
| Class of 1972 |
| Class of 1973 |
| Class of 1974 |
| Class of 1975 |
| Class of 1976 |
| Class of 1977 |
| Class of 1978 |
| Class of 1979 |