All postcodes in LL56 4
| Postcode | Place | Type |
|---|---|---|
| LL56 4SX | Y Felinheli | street |
| LL56 4SZ | Y Felinheli | street |
| LL56 4TJ | Y Felinheli | street |
| LL56 4TQ | Y Felinheli | street |
| LL56 4TX | Y Felinheli | street |
| LL56 4TZ | Y Felinheli | street |
| LL56 4UJ | Y Felinheli | street |
| LL56 4UQ | Y Felinheli | street |
| LL56 4UX | Y Felinheli | street |
| LL56 4UZ | Y Felinheli | street |
| LL56 4XA | Y Felinheli | street |
| LL56 4XD | Y Felinheli | street |
| LL56 4YJ | Y Felinheli | street |
| LL56 4YQ | Y Felinheli | street |
Places in sector LL56 4
- Y Felinheli 66
- Seion 1