All postcodes in DN21 9
| Postcode | Place | Type |
|---|---|---|
| DN21 9BD | Gainsborough | large user |
| DN21 9DY | Gainsborough | large user |
| DN21 9EP | Gainsborough | large user |
| DN21 9ER | Gainsborough | large user |
| DN21 9EU | Gainsborough | large user |
| DN21 9EZ | Gainsborough | large user |
| DN21 9FH | Gainsborough | large user |
| DN21 9FJ | Gainsborough | large user |
| DN21 9SB | Gainsborough | large user |
| DN21 9ZZ | — | large user |