| 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 |
| Costello, Douglas John | Carlisle Technical College | Prin P Hc | 1977 |
| Costello, Douglas John | Carlisle Technical College Administrative Staff | Principal 1 | 1979 |
| Costello, Douglas John | Carlisle Technical College Adminstrative Staff | Principal 2 | 1980 |
| Costello, Gregory John | Pingelly District High School | Master (Teacher) | 1980 |
| Costello, J. F. | Cyril Jackson Senior High School | Master (Teacher) | 1969 |
| Costello, J. F. | Cyril Jackson Senior High School | Master (Teacher) | 1970 |
| Costello, J.F. | Cyril Jackson Senior High School | Master (Teacher) | 1968 |
| Costello, James | Midland Junction High School | Master (Teacher) on Supply | 1955 |
| Costello, James | Midland Junction High School | Temporary Master (Teacher) | 1956 |
| Costello, James | Midland Junction High School | Master (Teacher) | 1957 |
| Costello, James | Midland Junction High School | Master (Teacher) | 1958 |
| Costello, James | Midland Junction Senior High School | Master (Teacher) | 1959 |
| Costello, James | Governor Stirling Senior High School | Master (Teacher) | 1960 |
| Costello, James | Governor Stirling High School | Master (Teacher) | 1961 |
| Costello, James | Governor Stirling Senior High School I | Master (Teacher) | 1962 |
| Costello, James | Govermor Stirling High School | Master (Teacher) | 1963 |
| Costello, James | Governor Stirling Senior High School | Master (Teacher) | 1964 |
| Costello, James | Governor Striling Senior High School | Master (Teacher) | 1965 |
| Costello, James | Governor Stirling High School | Master (Teacher) | 1966 |
| Costello, James | Governor Stirling Senior High School | Master (Teacher) | 1967 |
| Costello, James Frederick | Mount Lawley Senior High School | Master (Teacher) | 1976 |
