As a box code, 3204 is used for 10 post office box locations.
PO Boxes using 3204
| Suburb | Town | Province |
|---|---|---|
| Ashdown McP | Edendale | KwaZulu-Natal |
| Payipini (2) | Edendale | KwaZulu-Natal |
| Ashdown | Pietermaritzburg | KwaZulu-Natal |
| Copesville McP | Pietermaritzburg | KwaZulu-Natal |
| Express Gifts | Pietermaritzburg | KwaZulu-Natal |
| Glenwood | Pietermaritzburg | KwaZulu-Natal |
| Haniville | Pietermaritzburg | KwaZulu-Natal |
| Hayfields McP | Pietermaritzburg | KwaZulu-Natal |
| Linfield Park | Pietermaritzburg | KwaZulu-Natal |
| Azalea | Scottsville | KwaZulu-Natal |