| Code | Name | Region |
|---|---|---|
| AUCON | Colbinabbin | VIC |
| AUCST | Coldstream | VIC |
| AUIGA | Colignan | VIC |
| AUCLL | Collan Islands | WA |
| AUCRB | Collarenebri | NSW |
| AUOYL | Collaroy | NSW |
| AULTE | Collector | NSW |
| AUCPH | Clapham | SA |
| AUSCL | Clare | SA |
| AUCLM | Claremont | WA |
| AUCLR | Clarence River | NSW |
| AUCDN | Clarendon | SA |
| AUV5V | Clareville | NSW |
| AUSNN | Clarkson | WA |
| AUCAY | Clayton | QLD |
| AUCLY | Clayton/melbourne | VIC |
| AUCMQ | Clermont | QLD |
| AUCVC | Cleve | SA |
| AUCVN | Cleveland | QLD |
| AUCFT | Clifton | QLD |
| AUCFH | Clifton Hills | SA |
| AUCNJ | Cloncurry | QLD |
| AUCTF | Clontarf | NSW |
| AUCLO | Clontarf | QLD |
| AUCVL | Clovelly | NSW |
| AUCLP | Clovelly Park | SA |
| AUCLU | Clunes | NSW |
| AUCHL | Cheltenham/melbourne | VIC |
| AUCHE | Chermside | QLD |
| AUCBC | Cherrabun | WA |
| AUCRH | Cherribah | QLD |
| AUYRN | Cherry Gardens | SA |
| AUCYB | Cherrybook | NSW |
| AUUTH | Cheshunt | VIC |
| AUATL | Chester Hill | NSW |
| AUCHF | Chifley | NSW |
| AUCHS | Childers | QLD |
| AULLG | Chillagoe | QLD |
| AUCCL | Chinchilla | QLD |
| AUCN6 | Chinderah | NSW |
| AUDPP | Chippendale | NSW |
| AUCHN | Chipping Norton | NSW |
| AUCHT | Chittering | WA |
| AUCXQ | Christmas Creek | WA |
| AUCHU | Chullora | NSW |
| AUCCH | Churchill | VIC |
| AUTYC | City Beach | WA |
| AUCTB | Cataby | WA |
| AUCHB | Catherine Hill Bay | NSW |
| AUCTR | Cattle Creek | NT |