| Costa, Luigi Peter | Governor Stirling Senior High School | Master (Teacher) | 1978 |
| Costa, Luigi Peter | Governor Stirling Senior High School | Senior Master/Mistress (Teacher) Science and Physical Science | 1979 |
| Costa, Luigi Peter | Governor Stirling Senior High School | Master (Teacher) | 1980 |
| Costanzo, Silvana | Tranby Primary School | Mistress (Teacher) | 1979 |
| Costanzo, Silvana | Tranby Primary School | Mistress (Teacher) | 1980 |
| Costella, Winifred | Maylands II | Assistant Teacher on Supply | 1944 |
| Costello, Allan James | Mount Lawley Senior High School | Mistress (Teacher) | 1978 |
| Costello, Anne Dorothy | Kalamunda High School | Mistress (Teacher) | 1971 |
| Costello, Anne Dorothy | Mirrabooka Senior High School | Mistress (Teacher) | 1972 |
| Costello, B Mrs | Donnybrook Junior High School | Clerical Assistant | 1965 |
| Costello, B. | Donnybrook Junior High School | Clerical Assistant 0.2 | 1967 |
| Costello, B. | Donneybrook Junior High School | Cl Asst | 1968 |
| Costello, B. | Donnybrook Junior High School | CL Asst | 1969 |
| Costello, B. | Donnybrook Junior High School | Clerical Assistant 2/5 | 1970 |
| Costello, B. Mrs | Donnybrook Junior High School | 1/5 | 1966 |
| Costello, Cherie Louise | Boyanup Primary School III | Mistress (Teacher) | 1975 |
| Costello, Cherie Louise | Cooinda Primary School IA | Mistress (Teacher) | 1976 |
| Costello, Cherie Louise | Cooinda Primary School | Mistress (Teacher) | 1977 |
| Costello, Cherie Louise | Cooinda Primary School | Mistress (Teacher) | 1978 |
| Costello, Cherie Louise | Unattached | Mistress (Teacher) | 1979 |
| Costello, Costello Olga Beryl | Museum Classes | Acting Education Officer | 1977 |
| Costello, David | Balcatta Senior High School | Master (Teacher) on Probation | 1970 |
| Costello, David James | Rockingham High School | Master (Teacher) | 1971 |
| Costello, David James | Dumbleyung Junior High School | Master (Teacher) | 1973 |
| Costello, David James | Eastern Goldfields Tech School - Mathematics/Science | Lecturer C | 1975 |
| Costello, David James | Wembley Technical College - Mathematics/Science | Lecturer C | 1976 |
| Costello, David James | Wembley Technical College Mathematics/Science | Lecturer C P C | 1977 |
| Costello, David James | Wembley Technical College Mathematics/Science | Lecturer B | 1979 |
| Costello, David James | Wembley Technical College Mathematics/Science | Lecturer B. | 1980 |
| Costello, Douglas | Midland Junction Technical School Class II | Lecturer 2/S. | 1955 |
| Costello, Douglas | Midland Junction Technical School Class I | Lecturer 2 | 1956 |
| Costello, Douglas | Midland Junction Technical | Lecturer 1 | 1957 |
| Costello, Douglas | Midland Junction Technical II | Lecturer I | 1960 |
| Costello, Douglas | Midland Junction Technical | Lecturer II | 1961 |
| Costello, Douglas | Midland Technical School Science and Engineering | T.Senior Lecturer III | 1962 |
| Costello, Douglas | Midland Technical Science and Engineering Section | Lecturer III | 1963 |
| Costello, Douglas | Leederville Technical - Matriculation Section | Lecturer III | 1964 |
| Costello, Douglas | Mt Lawley Technical College | Lecturer III | 1965 |
| Costello, Douglas | Mt Lawley Technical College | Lecturer III | 1965 |
| Costello, Douglas | Mt Lawley Technical | T. Lecturer IIIA | 1966 |
| Costello, Douglas | Mt Lawley Technical Schools & Science Section | Senior Lecturer III. | 1967 |
| Costello, Douglas | Mount Lawley Tech College Science Section | T Sen Lect II | 1968 |
| Costello, Douglas | Eastern Goldfields Technical School Administrative Staff | D/Princ Gde II | 1969 |
| Costello, Douglas | Scarborough Technical Centre | R./O.I.C. Cl. II | 1970 |
| Costello, Douglas J. | Midland Junction Technical | Lecturer ll | 1959 |
| Costello, Douglas John | istrative Staff | Deputy Principal | 1971 |
| Costello, Douglas John | AlbanyTechnical Education Centre Administrative Staff Dept | Oic. Tc. 1 | 1972 |
| Costello, Douglas John | Carlisle Technical School Administrative Staff | Deputy Principal 1 | 1973 |
| Costello, Douglas John | Carlisle Technical School | Principal | 1975 |
| Costello, Douglas John | Carlisle Technical School | Principal | 1976 |
