| Costello, Raymond | Bentley Senior High School | Master (Teacher) | 1972 |
| Costello, Raymond | Bentley Senior High School | Master (Teacher) | 1973 |
| Costello, Raymond | Kalamunda Senior High School | Master (Teacher) | 1976 |
| Costello, Raymond | Kelmscott Senior High School | Master (Teacher) | 1977 |
| Costello, Raymond | Kelmscott Senior High School | Master (Teacher) | 1978 |
| Costello, Raymond | Audio Visual Education Branch | Relieving Education Officer | 1979 |
| Costello, Raymond | Audio Visual Educatiion Branch | R. ED. OFF. 2 | 1980 |
| Costello, Sandra | Bentley Senior High School | Temporary Mistress (Teacher) | 1968 |
| Costello, Sandra | Bentley Senior High School | MI./T. 1/2 | 1970 |
| Costello, Sandra | Cloverdale Primary School IA | Mistress (Teacher) | 1976 |
| Costello, Sandra | Kewdale Primary School | Mistress (Teacher) | 1977 |
| Costello, Sandra | Kewdale Primary School | Mistress (Teacher) | 1978 |
| Costello, Sandra | Kewdale Primary School | Mistress (Teacher) | 1979 |
| Costello, Sandra | Kewdale Primary School | Mistress (Teacher) | 1980 |
| Costello, Winifred | Inglewood I | Assistant Teacher on Supply | 1942 |
| Costello, Winifred | Inglewood I | Assistant Teacher on Supply | 1943 |
| Costello, Winifred | Maylands II | Assistant Teacher on Supply | 1945 |
| Costello, Winifred | Inglewood North III | Assistant Teacher on Supply | 1946 |
| Costello, Winifred | Inglewood North III | Assistant Teacher | 1947 |
| Costello, Winifred | Inglewood North III | Assistant Teacher | 1948 |
| Costello, Winifred | Inglewood North II | Assistant Teacher | 1949 |
| Costello, Winifred | Inglewood North High School II | Assistant Teacher | 1950 |
| Costello, Winifred | Inglewood North High School II | Assistant Teacher | 1951 |
| Costello, Winifred | Inglewood North I High School | Assistant Teacher | 1952 |
| Costello, Winifred | Inglewood North Primary School I | Assistant Teacher | 1953 |
| Costello, Winifred | Inglewood North SpI | Mistress (Teacher) | 1954 |
| Costello, Winifred | Inglewood North Primary School I | Mistress (Teacher) | 1955 |
| Costello, Winifred | Inglewood North Primary School | Mistress (Teacher) | 1956 |
| Costello, Winifred | Inglewood North Primary School | Mistress (Teacher) | 1957 |
| Costello, Winifred | Brentwood - Primary - Class II | Mistress (Teacher) | 1958 |
| Costello, Winifred | Brentwood Primary School | Mistress (Teacher) | 1959 |
| Costello, Winifred | Brentwood Primary School I | 1st Mistress (Teacher) | 1960 |
| Costello, Winifred | Brentwood Primary School I | 1st Mistress (Teacher) | 1962 |
| Costello, Winifred | Attadale Primary School I | Mistress (Teacher) | 1963 |
| Costello, Winifred | Attadale Primary School I | Mistress (Teacher) V.R. | 1964 |
| Costello, Winifred L. | Brentwood Primary School I | 1st Mistress (Teacher) | 1961 |
| Coster, Carrie | Claremont Primary School | MI/I | 1968 |
| Coster, Jane | Cue IV | Junior Monitor | 1905 |
| Coster, Jane | Cue IV | Junior Monitor | 1906 |
| Coster, Jane | Cue IV | Senior Monitor | 1907 |
| Coster, Jane | Cue IV | Assistant Teacher | 1910 |
| Coster, Jane | Cue IV | Assistant Teacher | 1911 |
| Coster, Jane | Cue VI | Assistant Teacher | 1912 |
| Coster, Jane | Cue V. | Assistant Teacher | 1914 |
| Coster, Jane | Cue V | Assistant Teacher | 1915 |
| Coster, Jane | Cne V | Assistant Teacher | 1917 |
| Coster, Lisa Karen | Wilson Park Primary School | Mistress (Teacher) Pre Primary | 1978 |
| Coster, Lisa Karen | Wilson Park Primary School | Mistress (Teacher) Pre Primary | 1979 |
| Coster, Susan Helen | Toodyay Junior HighSchool | Mistress (Teacher) | 1973 |
| Costley, Helen Elizabeth | Merredin Senior High School | Mistress (Teacher) | 1980 |
