| Costello, James Frederick | Mount Lawley Senior High School | Master (Teacher) | 1977 |
| Costello, James Frederick | Mount Lawley Senior High School | Master (Teacher) | 1979 |
| Costello, James Frederick | Mount Lawley Senior High School | Master (Teacher) | 1980 |
| Costello, James Fredrick | Cyril Jackson Senior High School | Master (Teacher) | 1971 |
| Costello, James Fredrick | Cyril Jackson Senior High School | Master (Teacher) | 1972 |
| Costello, James Fredrick | Mount Lawley Senior High School | Master (Teacher) | 1975 |
| Costello, James G. | Cannington High School | Master (Teacher) | 1968 |
| Costello, James G. | Hampton Senior High School | Master (Teacher) | 1969 |
| Costello, James G. | Hampton Senior High School | Master (Teacher) | 1970 |
| Costello, John | Midland Junction Technical | Lecturer II | 1958 |
| Costello, Louise Anne | Belmont Senior High School | Mistress (Teacher) | 1975 |
| Costello, Louise Anne | Belmont Senior High School | Mistress (Teacher) | 1976 |
| Costello, Louise Anne | Belmont Senior High School | Mistress (Teacher) | 1977 |
| Costello, Louise Anne | Langford Primary School | Mistress (Teacher) | 1979 |
| Costello, Louise Anne | Langford Primary School | Mistress (Teacher) | 1980 |
| Costello, Marisa Rita | Belmont Senior High School | Mistress (Teacher) | 1978 |
| Costello, Mary | Bindu VII | Head Teacher on Probation | 1928 |
| Costello, Mary | Ejanding VII. | Head Teacher on Probation | 1929 |
| Costello, Noel | Rocky Gully | Master (Teacher) on Probation | 1959 |
| Costello, Noel | Rocky Gully Primary School III | Master (Teacher) on Probation | 1960 |
| Costello, Noel | Scarborough North Primary School I | Master (Teacher) | 1962 |
| Costello, Noel | North Scarborough Primary School I | Master (Teacher) | 1963 |
| Costello, Noel | Scarborough North Primary School I | Master (Teacher) | 1964 |
| Costello, Noel | Scarborough North Primary School | Master (Teacher) | 1965 |
| Costello, Noel | Churchlands High School | Master (Teacher) | 1966 |
| Costello, Noel | Churchlands Senior High School | Master (Teacher) | 1967 |
| Costello, Noel F. | Rock Gully Primary School III | Master (Teacher) | 1961 |
| Costello, Noel F. | Churchlands Senior High School | MA | 1968 |
| Costello, Noel F. | Churchlands Senior High School | Master (Teacher) | 1969 |
| 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 |
