Postcode areas 23XX
- Postcode area 2300
- Postcode area 2310
- Postcode area 2320
- Postcode area 2321
- Postcode area 2322
- Postcode area 2323
- Postcode area 2328
- Postcode area 2330
- Postcode area 2340
- Postcode area 2350
- Postcode area 2360
- Postcode area 2370
- Postcode area 2380
- Postcode area 2381
- Postcode area 2382
- Postcode area 2387
- Postcode area 2390