SG
19 districts, 12,172 postcodes
North Hertfordshire, East Hertfordshire, Central Bedfordshire, Stevenage, South Cambridgeshire, Welwyn Hatfield, and others
| District | Postcodes | Local authority |
|---|---|---|
| SG1 | 1,275 | Stevenage |
| SG10 | 108 | East Hertfordshire |
| SG11 | 379 | East Hertfordshire |
| SG12 | 941 | East Hertfordshire |
| SG13 | 531 | East Hertfordshire |
| SG14 | 624 | East Hertfordshire |
| SG15 | 120 | Central Bedfordshire |
| SG16 | 196 | Central Bedfordshire |
| SG17 | 403 | Central Bedfordshire |
| SG18 | 762 | Central Bedfordshire |
| SG19 | 680 | Central Bedfordshire |
| SG2 | 854 | Stevenage |
| SG3 | 206 | North Hertfordshire |
| SG4 | 906 | North Hertfordshire |
| SG5 | 952 | North Hertfordshire |
| SG6 | 980 | North Hertfordshire |
| SG7 | 442 | North Hertfordshire |
| SG8 | 1,298 | South Cambridgeshire |
| SG9 | 515 | East Hertfordshire |