As a box code, 3306 is used for 7 post office box locations.
PO Boxes using 3306
| Suburb | Town | Province |
|---|---|---|
| Emazabekweni | Highflats | KwaZulu-Natal |
| Hlokosi | Highflats | KwaZulu-Natal |
| Kwa Thathani | Highflats | KwaZulu-Natal |
| Ndwebu | Highflats | KwaZulu-Natal |
| Ndwebu 1 | Highflats | KwaZulu-Natal |
| Ndwebu 2 | Highflats | KwaZulu-Natal |
| Highflats | Mooi River | KwaZulu-Natal |