SG postcode area
The SG area holds 19 districts and 12,179 live postcodes; its largest place is Stevenage.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| SG1 | 1,284 | Stevenage |
| SG2 | 852 | Walkern |
| SG3 | 206 | Knebworth |
| SG4 | 906 | Codicote |
| SG5 | 952 | Hitchin |
| SG6 | 978 | Letchworth Garden City |
| SG7 | 442 | Baldock |
| SG8 | 1,299 | Royston |
| SG9 | 515 | Buntingford |
| SG10 | 108 | Much Hadham |
| SG11 | 379 | Puckeridge |
| SG12 | 939 | Ware |
| SG13 | 532 | Little Amwell |
| SG14 | 625 | Hertford |
| SG15 | 120 | Arlesey |
| SG16 | 196 | Henlow |
| SG17 | 403 | Shefford |
| SG18 | 764 | Biggleswade |
| SG19 | 679 | Sandy |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.