All postcodes in L20 1
| Postcode | Place | Type |
|---|---|---|
| L20 1AB | Liverpool | street |
| L20 1AD | Bootle | street |
| L20 1AF | Bootle | street |
| L20 1AH | Bootle | street |
| L20 1AL | Bootle | street |
| L20 1AN | Bootle | large user |
| L20 1AS | Bootle | street |
| L20 1AW | Bootle | street |
| L20 1BA | Bootle | street |
| L20 1BE | Bootle | street |
| L20 1BG | Crosby | street |
| L20 1BL | Bootle | street |
| L20 1BN | Bootle | street |
| L20 1BP | Bootle | street |
| L20 1BQ | Bootle | street |
| L20 1BS | — | street |
| L20 1BX | Bootle | street |
| L20 1BY | Bootle | street |
| L20 1DB | Bootle | street |
| L20 1DE | Liverpool | street |
| L20 1DR | Bootle | street |
| L20 1EA | Bootle | large user |
| L20 1EB | Bootle | street |
| L20 1ED | Bootle | street |
| L20 1EE | Bootle | street |
| L20 1EF | Bootle | street |
| L20 1EP | Bootle | street |
| L20 1ES | Bootle | street |
| L20 1EZ | Bootle | large user |
| L20 1HA | Bootle | street |
| L20 1HB | Bootle | street |