| Cosgrove, Valarie Patricia | Dampier Primary School | Principal Mistress | 1978 |
| Cosgrove, Valerie | Wembley Primary School | Mistress (Teacher) | 1970 |
| Cosgrove, Valerie P. | Wembley Primary School | Mistress (Teacher) on Probation | 1968 |
| Cosgrove, Valerie Patricia | Wembley Primary School | Master (Teacher) | 1971 |
| Cosgrove, Valerie Patricia | Wembley Primary School | Mistress (Teacher) | 1972 |
| Cosgrove, Valerie Patricia | Unattached Education Department Primary Education Division | Mistress (Teacher) | 1973 |
| Cosgrove, Valerie Patricia | Davallia Primary School IA | 1st Mistress (Teacher) | 1975 |
| Cosgrove, Valerie Patricia | Davallia Primary School IA | Mistress (Teacher) | 1976 |
| Cosgrove, Valerie Patricia | Davallia Primary School | Mistress (Teacher) | 1977 |
| Cosgrove, Valerie Patricia | Dampier Primary School | Deputy Principal F | 1979 |
| Cosier, Carrie | Mount Pleasant Primary School | Mistress (Teacher) on Supply | 1959 |
| Cosier, Carrie | Claremont Primary School I | Mistress (Teacher) on Supply T.T. | 1961 |
| Cosier, Carrie | Claremont Primary School I | Mistress (Teacher) on Supply | 1962 |
| Cosier, Carrie | Claremont Primary School IA I | Mistress (Teacher) on Supply | 1963 |
| Cosier, Carrie | Claremont Primary School IA I | Mistress (Teacher) on Supply | 1964 |
| Cosier, Carrie | Claremont IA Primary School | Mistress (Teacher) on Supply | 1965 |
| Cosier, Carrie | Claremont Primary School | Mistress (Teacher) on Supply | 1966 |
| Cosier, Carrie | Claremont Primary School | Temporary Mistress (Teacher) | 1967 |
| Cosier, Carrie | Claremont Primary School | Temporary Mistress (Teacher) | 1969 |
| Cosier, Carrie Gay | In Service Education Branch | A A. D. T. 2 P. | 1971 |
| Cosier, Carrie Gay | Mt Lawley Teachers College | Lecturer A. | 1972 |
| Cosier, Corrie | In Service Education Branch | A. Advisory Teacher II | 1970 |
| Cosney, Leslie | Kurramia VIII | Head Teacher | 1918 |
| Cossil, Carolyn | Tranby Primary School | Mi/T. | 1970 |
| Cossil, Carolyn | Tranby Primary School | Mistress (Teacher) | 1972 |
| Cossill, Carolyn | Tranby Primary School | Mistress (Teacher) | 1971 |
| Cossing, Kimball | Bunbury High School | Master (Teacher) | 1957 |
| Cossins, T. A. | Plympton Infants IV | Head Teacher | 1900 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1901 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1902 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1903 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1904 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1905 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1906 |
| Cossins, Tryphena A. | Plympton Infants IV | Head Teacher | 1907 |
| Cossins, Tryphena A. | Plympton Infants IV | H.T (on leave) | 1908 |
| Cosslett, Lorraine Fay | Eastern Goldfields Senior High School | Mistress (Teacher) | 1971 |
| Cosstick, Peter Laurence | Mount Barker Primary School I | Master (Teacher) | 1973 |
| Cosstick, Peter Laurence | Mount Barker Primary School IA | Master (Teacher) | 1975 |
| Cosstick, Peter Laurence | Onslow Primary School II | Master (Teacher) | 1976 |
| Cosstick, Peter Laurence | Onslow Primary School | Master (Teacher) | 1977 |
| Cosstick, Susan Elizabeth | Mount Barker Primary School I | Mistress (Teacher) | 1973 |
| Cosstick, Susan Elizabeth | Mount Barker Primary School IA | Mistress (Teacher) | 1975 |
| Cosstick, Susan Elizabeth | Onslow Primary School II | Mistress (Teacher) | 1976 |
| Cosstick, Susan Elizabeth | Onslow Primary School | Mistress (Teacher) | 1977 |
| Cosstick, Susan Elizabeth | Onslow Primary School | Mistress (Teacher) | 1978 |
| Costa, Luigi Peter | Governor Stirling Senior High School | Master (Teacher) | 1973 |
| Costa, Luigi Peter | Governor Stirling Senior High | Master (Teacher) | 1975 |
| Costa, Luigi Peter | Governor Stirling Senior High School | Master (Teacher) | 1976 |
| Costa, Luigi Peter | Governor Stirling Senior High | Master (Teacher) | 1977 |
