All postcodes in SG18 1
| Postcode | Place | Type |
|---|---|---|
| SG18 1AP | Biggleswade | large user |
| SG18 1AS | Biggleswade | large user |
| SG18 1BE | Biggleswade | large user |
| SG18 1BH | Biggleswade | large user |
| SG18 1BP | Biggleswade | large user |
| SG18 1BX | Biggleswade | large user |
| SG18 1BY | Biggleswade | large user |