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SG6 9GL
a defunct large user postcode in Letchworth Garden, North Hertfordshire, Hertfordshire
This postcode was deleted in November 2018.
The nearest currently active postcodes are:
SG6 9GZ
SG6 9HA
SG6 9GX
SG6 9GW
SG6 9GU
SG6 9GE
SG6 9GS
SG6 9GQ
SG15 6WW
SG6 9GF