| Costello, Noel F. | Churchlands Senior High School | Master (Teacher) | 1970 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1971 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1972 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1973 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1975 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1976 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1977 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1978 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1979 |
| Costello, Noel Francis | Churchlands Senior High School | Master (Teacher) | 1980 |
| Costello, Olga Beryl | Albany Senior High School | Mistress (Teacher) | 1972 |
| Costello, Olga Beryl | Rossmoyne Senior High School | Mistress (Teacher) | 1973 |
| Costello, Olga Beryl | Museum Classes | Education Officer | 1975 |
| Costello, Olga Beryl | Museum Classes Education Department Perth | Acting Education Officer | 1976 |
| Costello, Patricia | Mortigallup VII | Temporary Head Teacher on Supply | 1937 |
| Costello, Patricia | Mortigallup VII | Temporary Head Teacher on Supply | 1938 |
| Costello, Patricia | Hoffman Mill VI | Head Teacher on Supply | 1944 |
| Costello, Raymond | Bentley Senior High School | Temporary Master (Teacher) | 1968 |
| Costello, Raymond | Bentley Sernior High School | Temporary Master (Teacher) | 1969 |
| Costello, Raymond | Bentley Senior High School | Master (Teacher) | 1970 |
| Costello, Raymond | Bentley Senior High School | Master (Teacher) | 1971 |
| 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 |
